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CVE-2025-11961

OOBR and OOBW in pcap_ether_aton() in libpcap

1.9 LowFix available

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.12%Up 0.1 points since Dec 31, 2025
90%50%10%1%

What each source reports

CVE List Score used 1.9

OOBR and OOBW in pcap_ether_aton() in libpcap

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-126, CWE-122
Updated
2026-11-02
EUVDEUVD-2025-205869 1.9

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
EUVD-2025-205869
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-x25x-vjrm-h7qq 1.9

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a...

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
GHSA-x25x-vjrm-h7qq
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-122
Updated
2026-11-02
NVD 1.9

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-122, CWE-126
Updated
2026-11-02
OSVALPINE-CVE-2025-11961 1.9

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
ALPINE-CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVBELL-CVE-2025-11961 1.9
Record
BELL-CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
Show 26 moreShow less
OSV 1.9

OOBR and OOBW in pcap_ether_aton() in libpcap

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-122, CWE-126
Updated
2026-11-02
OSVDEBIAN-CVE-2025-11961 1.9

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
DEBIAN-CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1109 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1109
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1110 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1110
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1111 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1111
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1112 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1112
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1113 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1113
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1114 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1114
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVOESA-2026-1207 1.9

libpcap security update

This is the official web site of tcpdump, a powerful command-line packet analyzer; and libpcap, a portable C/C++ library for network traffic capture.

Security Fix(es):

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.(CVE-2025-11961)

Record
OESA-2026-1207
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2025-11961 1.9

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
UBUNTU-CVE-2025-11961
CVSS 3.1
1.9 LowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVAZL-73335 No score

CVE-2025-11961 affecting package libpcap for versions less than 1.10.6-1

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
AZL-73335
Updated
2026-11-02
OSVAZL-73344 No score

CVE-2025-11961 affecting package nmap for versions less than 7.95-3

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
AZL-73344
Updated
2026-11-05
OSVAZL-73373 No score

CVE-2025-11961 affecting package libpcap for versions less than 1.10.1-5

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
AZL-73373
Updated
2026-11-02
OSVAZL-73379 No score

CVE-2025-11961 affecting package nmap for versions less than 7.93-4

pcap_ether_aton() is an auxiliary function in libpcap, it takes a string argument and returns a fixed-size allocated buffer. The string argument must be a well-formed MAC-48 address in one of the supported formats, but this requirement has been poorly documented. If an application calls the function with an argument that deviates from the expected format, the function can read data beyond the end of the provided string and write data beyond the end of the allocated buffer.

Record
AZL-73379
Updated
2026-11-02
OSVMGASA-2026-0005 No score

Updated libpcap packages fix security vulnerability

OOBR and OOBW in pcap_ether_aton() in libpcap. (CVE-2025-11961)

Record
MGASA-2026-0005
Updated
2026-11-02
OSVopenSUSE-SU-2026:10032-1 No score

libpcap-devel-1.10.6-1.1 on GA media

These are all security issues fixed in the libpcap-devel-1.10.6-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10032-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20075-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
openSUSE-SU-2026:20075-1
Updated
2026-11-02
OSVSUSE-SU-2026:0036-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:0036-1
Updated
2026-11-02
OSVSUSE-SU-2026:0053-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:0053-1
Updated
2026-11-02
OSVSUSE-SU-2026:0062-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:0062-1
Updated
2026-11-02
OSVSUSE-SU-2026:0063-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:0063-1
Updated
2026-11-02
OSVSUSE-SU-2026:0575-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:0575-1
Updated
2026-11-02
OSVSUSE-SU-2026:20048-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:20048-1
Updated
2026-11-02
OSVSUSE-SU-2026:20064-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
  • CVE-2024-8006: missing return value check in pcap_findalldevs_ex() can lead to NULL pointer dereference (bsc#1230034).
  • CVE-2023-7256: unclear value returned by sock_initaddress() can lead to a double-free (bsc#1230020).
Record
SUSE-SU-2026:20064-1
Updated
2026-11-02
OSVSUSE-SU-2026:20120-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:20120-1
Updated
2026-11-02
OSVSUSE-SU-2026:20153-1 No score

Security update for libpcap

This update for libpcap fixes the following issues:

  • CVE-2025-11961: missing validation of provided MAC-48 address string in pcap_ether_aton() can lead to out-of-bounds read and write (bsc#1255765).
Record
SUSE-SU-2026:20153-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libpcap
Alpine:v3.21
before 1.10.7-r0
1.10.7-r0
libpcap
Alpine:v3.22
before 1.10.7-r0
1.10.7-r0
libpcap
Alpine:v3.23
before 1.10.7-r0
1.10.7-r0
libpcap
Alpine:v3.24
before 1.10.6-r0
1.10.6-r0
libpcap
Azure Linux:3
before 1.10.6-1
1.10.6-1
nmap
Azure Linux:3
before 7.95-3
7.95-3
libpcap
Azure Linux:2
before 1.10.1-5
1.10.1-5
nmap
Azure Linux:2
before 7.93-4
7.93-4
libpcap
Alpaquita:23
1.10.1-r0 up to 1.10.7-r0
1.10.7-r0
libpcap
Alpaquita:25
1.10.5-r0 up to 1.10.7-r0
1.10.7-r0
Show 35 moreShow less
Affected packages
PackageAffectedFixed
libpcap
Alpaquita:stream
1.10.1-r0 up to 1.10.6-r0
1.10.6-r0
libpcap
Debian:12
All versions, plus listed versions
1.10.3-11.10.4-11.10.4-21.10.4-31.10.4-4
Show 8 moreShow less
1.10.4-4.11.10.4-4.1~exp11.10.4-51.10.4-5+hurd.11.10.5-11.10.5-21.10.6-11.10.6-2
None known
libpcap
Debian:13
All versions, plus listed versions
1.10.5-21.10.6-11.10.6-2
None known
libpcap
Debian:14
before 1.10.6-1, plus listed versions
1.10.5-2
1.10.6-1
libpcap
Mageia:9
before 1.10.6-1.mga9
1.10.6-1.mga9
libpcap
openEuler:24.03-LTS
before 1.10.4-5.oe2403
1.10.4-5.oe2403
libpcap
openEuler:24.03-LTS-SP1
before 1.10.4-5.oe2403sp1
1.10.4-5.oe2403sp1
libpcap
openEuler:24.03-LTS-SP2
before 1.10.4-5.oe2403sp2
1.10.4-5.oe2403sp2
libpcap
openEuler:24.03-LTS-SP3
before 1.10.4-5.oe2403sp3
1.10.4-5.oe2403sp3
libpcap
openEuler:22.03-LTS-SP3
before 1.10.3-4.oe2203sp3
1.10.3-4.oe2203sp3
libpcap
openEuler:22.03-LTS-SP4
before 1.10.3-4.oe2203sp4
1.10.3-4.oe2203sp4
libpcap
openEuler:20.03-LTS-SP4
before 1.9.1-8.oe2003sp4
1.9.1-8.oe2003sp4
libpcap
openSUSE:Leap 15.6
before 1.10.4-150600.3.9.1
1.10.4-150600.3.9.1
libpcap
SUSE:Linux Enterprise Micro 5.2
before 1.9.1-150300.3.6.1
1.9.1-150300.3.6.1
libpcap
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5
before 1.8.1-10.9.1
1.8.1-10.9.1
libpcap
SUSE:Linux Enterprise Module for Basesystem 15 SP7
before 1.10.5-150700.3.7.1
1.10.5-150700.3.7.1
libpcap
SUSE:Linux Enterprise Module for Package Hub 15 SP7
before 1.10.5-150700.3.7.1
1.10.5-150700.3.7.1
libpcap
SUSE:Linux Enterprise Micro 5.3
before 1.10.1-150400.3.9.1
1.10.1-150400.3.9.1
libpcap
SUSE:Linux Enterprise Micro 5.4
before 1.10.1-150400.3.9.1
1.10.1-150400.3.9.1
libpcap
SUSE:Linux Enterprise Micro 5.5
before 1.10.1-150400.3.9.1
1.10.1-150400.3.9.1
libpcap
SUSE:Linux Micro 6.0
before 1.10.4-4.1
1.10.4-4.1
libpcap
SUSE:Linux Micro 6.1
From an advisory covering 3 CVEs
before 1.10.4-slfo.1.1_2.1
1.10.4-slfo.1.1_2.1
libpcap
SUSE:Linux Enterprise Server 16.0
before 1.10.5-160000.4.1
1.10.5-160000.4.1
libpcap
SUSE:Linux Enterprise Server for SAP applications 16.0
before 1.10.5-160000.4.1
1.10.5-160000.4.1
libpcap
SUSE:Linux Micro 6.2
before 1.10.5-160000.4.1
1.10.5-160000.4.1
libpcap
Ubuntu:Pro:14.04:LTS
All versions, plus listed versions
1.4.0-21.5.1-11.5.2-11.5.3-11.5.3-21.5.3-2ubuntu0.11.5.3-2ubuntu0.1+esm1
None known
libpcap
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.7.4-11.7.4-21.7.4-2ubuntu0.11.7.4-2ubuntu0.1+esm1
None known
libpcap
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
1.8.1-5ubuntu11.8.1-6ubuntu11.8.1-6ubuntu1.18.04.11.8.1-6ubuntu1.18.04.21.8.1-6ubuntu1.18.04.2+esm1
None known
libpcap
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1.9.1-21.9.1-31.9.1-3ubuntu1.20.04.11.9.1-3ubuntu1.20.04.1+esm1
None known
libpcap
Ubuntu:22.04:LTS
All versions, plus listed versions
1.10.0-2build11.10.1-41.10.1-4build11.10.1-4ubuntu1.22.04.11.10.1-4ubuntu1.22.04.2
None known
libpcap
Ubuntu:24.04:LTS
All versions, plus listed versions
1.10.4-41.10.4-4ubuntu31.10.4-4.1ubuntu21.10.4-4.1ubuntu31.10.4-4.1ubuntu3.1
None known
libpcap
Ubuntu:25.10
All versions, plus listed versions
1.10.5-2ubuntu11.10.5-2ubuntu2
None known
libpcap
Ubuntu:26.04:LTS
All versions, plus listed versions
1.10.5-2ubuntu21.10.5-2ubuntu31.10.6-1ubuntu11.10.6-1ubuntu1.1
None known
libpcap
openSUSE:Tumbleweed
before 1.10.6-1.1
1.10.6-1.1
libpcap
openSUSE:Leap 16.0
before 1.10.5-160000.4.1
1.10.5-160000.4.1

History

History
RecordedChangedSources
affected
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Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-11961 is a low vulnerability (CVSS 1.9) in The Tcpdump Group Libpcap, published December 31, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. Fixed in libpcap 1.10.7-r0.

References

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