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CVE-2025-9817

NULL Pointer Dereference in Wireshark

7.8 HighFix available

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.21%Up 0.2 points since Sep 3, 2025
90%50%10%1%

What each source reports

CVE List Score used 7.8

NULL Pointer Dereference in Wireshark

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
CVE-2025-9817
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-476
Updated
2026-11-02
EUVDEUVD-2025-26492 7.8

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
EUVD-2025-26492
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-3mqq-9w3m-xpj8 7.5

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
GHSA-3mqq-9w3m-xpj8
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
NVD 7.8

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
CVE-2025-9817
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSV 7.8

NULL Pointer Dereference in Wireshark

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
CVE-2025-9817
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-476
Updated
2026-11-02
OSVDEBIAN-CVE-2025-9817 7.5

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
DEBIAN-CVE-2025-9817
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 17 moreShow less
OSVOESA-2025-2263 7.8

wireshark security update

Security Fix(es):

A vulnerability classified as problematic (CWE-476) has been found in Wireshark versions 4.4.0 to 4.4.8. The application dereferences a pointer that it expects to be valid but is NULL, typically causing a crash or exit, impacting availability. Upgrading to version 4.4.9 eliminates this vulnerability.(CVE-2025-9817)

Record
OESA-2025-2263
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2025-2264 7.8

wireshark security update

Security Fix(es):

A vulnerability classified as problematic (CWE-476) has been found in Wireshark versions 4.4.0 to 4.4.8. The application dereferences a pointer that it expects to be valid but is NULL, typically causing a crash or exit, impacting availability. Upgrading to version 4.4.9 eliminates this vulnerability.(CVE-2025-9817)

Record
OESA-2025-2264
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2025-2265 7.8

wireshark security update

Security Fix(es):

A vulnerability classified as problematic (CWE-476) has been found in Wireshark versions 4.4.0 to 4.4.8. The application dereferences a pointer that it expects to be valid but is NULL, typically causing a crash or exit, impacting availability. Upgrading to version 4.4.9 eliminates this vulnerability.(CVE-2025-9817)

Record
OESA-2025-2265
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2025-2266 7.8

wireshark security update

Security Fix(es):

A vulnerability classified as problematic (CWE-476) has been found in Wireshark versions 4.4.0 to 4.4.8. The application dereferences a pointer that it expects to be valid but is NULL, typically causing a crash or exit, impacting availability. Upgrading to version 4.4.9 eliminates this vulnerability.(CVE-2025-9817)

Record
OESA-2025-2266
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVOESA-2025-2267 7.8

wireshark security update

Security Fix(es):

A vulnerability classified as problematic (CWE-476) has been found in Wireshark versions 4.4.0 to 4.4.8. The application dereferences a pointer that it expects to be valid but is NULL, typically causing a crash or exit, impacting availability. Upgrading to version 4.4.9 eliminates this vulnerability.(CVE-2025-9817)

Record
OESA-2025-2267
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVRHSA-2026:1714 5.5

Red Hat Security Advisory: wireshark security update

Record
RHSA-2026:1714
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:2763 5.5

Red Hat Security Advisory: wireshark security update

Record
RHSA-2026:2763
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2026:1714 5.5

Moderate: wireshark security update

The wireshark packages contain a network protocol analyzer used to capture and browse the traffic running on a computer network.

Security Fix(es):

  • Wireshark: NULL Pointer Dereference in Wireshark (CVE-2025-9817)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:1714
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2025-9817 7.8

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
UBUNTU-CVE-2025-9817
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVALSA-2026:1714 No score

Moderate: wireshark security update

The wireshark packages contain a network protocol analyzer used to capture and browse the traffic running on a computer network.

Security Fix(es):

  • Wireshark: NULL Pointer Dereference in Wireshark (CVE-2025-9817)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:1714
Updated
2026-11-02
OSVAZL-66770 No score

CVE-2025-9817 affecting package wireshark 4.4.7-2

SSH dissector crash in Wireshark 4.4.0 to 4.4.8 allows denial of service

Record
AZL-66770
Updated
2026-11-05
OSVMGASA-2026-0184 No score

Updated wireshark packages fix security vulnerabilities

Multiple vulnerabilities have been discovered in Wireshark, a network protocol analyzer, which could result in denial of service or the execution of arbitrary code. This update fixes the reported issue.

Record
MGASA-2026-0184
Updated
2026-11-02
OSVopenSUSE-SU-2025:15522-1 No score

libwireshark18-4.4.9-2.1 on GA media

These are all security issues fixed in the libwireshark18-4.4.9-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15522-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20151-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to Wireshark 4.4.13:

  • CVE-2025-11626: MONGO dissector infinite loop (bsc#1251933).
  • CVE-2025-13499: Kafka dissector crash (bsc#1254108).
  • CVE-2025-13945: HTTP3 dissector crash (bsc#1254471).
  • CVE-2025-13946: MEGACO dissector infinite loop (bsc#1254472).
  • CVE-2025-9817: SSH dissector crash (bsc#1249090).
  • CVE-2026-0959: IEEE 802.11 dissector crash (bsc#1256734).
  • CVE-2026-0961: BLF file parser crash (bsc#1256738).
  • CVE-2026-0962: SOME/IP-SD dissector crash (bsc#1256739).

Full changelog:

https://www.wireshark.org/docs/relnotes/wireshark-4.4.13.html

Record
openSUSE-SU-2026:20151-1
Updated
2026-11-02
OSVSUSE-SU-2025:03294-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to version 4.2.13.

Security issues fixed:

  • CVE-2025-9817: SSH dissector crash due to NULL pointer dereference when processing malformed packet traces (bsc#1249090).

Non-security issues fixed:

  • Bug in UDS dissector with Service ReadDataByPeriodicIdentifier Response.
  • Incorrectly parsed application/x-www-form-urlencoded key following a name-value byte sequence with no =.
  • DNP3 time stamp not working after epoch time (year 2038).
  • Bug in LZ77 decoder; reads a 16-bit length when it should read a 32-bit length.
Record
SUSE-SU-2025:03294-1
Updated
2026-11-02
OSVSUSE-SU-2026:1169-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update Wireshark to version 4.6.4 (jsc#PED-15400).

  • CVE-2024-9780: ITS dissector crash (bsc#1231475).
  • CVE-2024-9781: AppleTalk and RELOAD Framing dissector crash (bsc#1231476).
  • CVE-2024-11595: Loop with Unreachable Exit Condition ('Infinite Loop') in Wireshark (bsc#1233594).
  • CVE-2024-11596: Buffer Over-read in Wireshark (bsc#1233593).
  • CVE-2025-1492: Uncontrolled Recursion in Wireshark (bsc#1237414).
  • CVE-2025-5601: Column handling crashes in Wireshark allows denial of service (bsc#1244081).
  • CVE-2025-9817: NULL Pointer Dereference in ssh dissector (bsc#1249090).
  • CVE-2025-13499: a malformed packet can lead to a Kafka dissector crash (bsc#1254108).
  • CVE-2025-13674: injecting a malformed packet can cause a crash (bsc#1254262).
  • CVE-2025-13945: HTTP3 dissector crash in Wireshark 4.6.0 and 4.6.1 allows denial of service (bsc#1254471).
  • CVE-2025-13946: MEGACO dissector infinite loop in Wireshark 4.6.0 to 4.6.1 and 4.4.0 to 4.4.11 allows denial of service (bsc#1254472).
  • CVE-2026-0959: denial of service via IEEE 802.11 protocol dissector crash (bsc#1256734).
  • CVE-2026-0960: denial of Service via HTTP3 protocol dissector infinite loop (bsc#1256736).
  • CVE-2026-0961: denial of Service vulnerability in BLF file parser (bsc#1256738).
  • CVE-2026-0962: denial of Service via SOME/IP-SD protocol dissector crash (bsc#1256739).
  • CVE-2026-3201: missing limit checks in USB HID protocol dissector's parse_report_descriptor function can lead to memory exhaustion (bsc#1258907).
  • CVE-2026-3202: missing checks in NTS-KE protocol dissector can lead to crash (bsc#1258908).
  • CVE-2026-3203: missing length checks in the RF4CE Profile protocol dissector can lead to illegal memory access and crash (bsc#1258909).

Also libvirt was rebuilt against wireshark for the libvirt plugin.

Record
SUSE-SU-2026:1169-1
Updated
2026-11-02
OSVSUSE-SU-2026:20222-1 No score

Security update for wireshark

This update for wireshark fixes the following issues:

Update to Wireshark 4.4.13:

  • CVE-2025-11626: MONGO dissector infinite loop (bsc#1251933).
  • CVE-2025-13499: Kafka dissector crash (bsc#1254108).
  • CVE-2025-13945: HTTP3 dissector crash (bsc#1254471).
  • CVE-2025-13946: MEGACO dissector infinite loop (bsc#1254472).
  • CVE-2025-9817: SSH dissector crash (bsc#1249090).
  • CVE-2026-0959: IEEE 802.11 dissector crash (bsc#1256734).
  • CVE-2026-0961: BLF file parser crash (bsc#1256738).
  • CVE-2026-0962: SOME/IP-SD dissector crash (bsc#1256739).

Full changelog:

https://www.wireshark.org/docs/relnotes/wireshark-4.4.13.html

Record
SUSE-SU-2026:20222-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wireshark
AlmaLinux:10
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-cli
AlmaLinux:10
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-devel
AlmaLinux:10
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark
Azure Linux:3
 through 4.4.7-2 None known
wireshark
Debian:12
 before 4.0.17-0+deb12u2, plus listed versions
4.0.10-14.0.11-14.0.11-1~deb12u14.0.17-0+deb12u14.0.3-1
Show 6 moreShow less
4.0.5-1~exp14.0.6-14.0.6-1~deb12u14.0.6-1~exp14.0.7-14.0.8-1
4.0.17-0+deb12u2
wireshark
Debian:13
 before 4.4.13-0+deb13u1, plus listed versions
4.4.7-14.4.8-0exp14.4.9-1
4.4.13-0+deb13u1
wireshark
Debian:14
 before 4.4.9-1, plus listed versions
4.4.7-14.4.8-0exp1
4.4.9-1
wireshark
Debian:13
From an advisory covering 9 CVEs
 before 4.4.13-0+deb13u1, plus listed versions
4.4.7-14.4.8-0exp14.4.9-1
4.4.13-0+deb13u1
wireshark
Mageia:9
From an advisory covering 21 CVEs
 before 4.0.17-1.2.mga9
4.0.17-1.2.mga9
wireshark
openEuler:24.03-LTS
 before 4.4.7-3.oe2403
4.4.7-3.oe2403
Show 38 moreShow less
Affected packages
PackageAffectedFixed
wireshark
openEuler:24.03-LTS-SP1
 before 4.4.7-2.oe2403sp1
4.4.7-2.oe2403sp1
wireshark
openEuler:24.03-LTS-SP2
 before 4.4.7-2.oe2403sp2
4.4.7-2.oe2403sp2
wireshark
openEuler:22.03-LTS-SP3
 before 4.4.7-2.oe2203sp3
4.4.7-2.oe2203sp3
wireshark
openEuler:22.03-LTS-SP4
 before 4.4.7-2.oe2203sp4
4.4.7-2.oe2203sp4
wireshark
Red Hat:enterprise_linux:10.1
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-cli
Red Hat:enterprise_linux:10.1
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-cli-debuginfo
Red Hat:enterprise_linux:10.1
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-debuginfo
Red Hat:enterprise_linux:10.1
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-debugsource
Red Hat:enterprise_linux:10.1
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark-devel
Red Hat:enterprise_linux:10.1
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark
Red Hat:enterprise_linux_eus:10.0
 before 1:4.4.2-3.el10_0.2
1:4.4.2-3.el10_0.2
wireshark-cli
Red Hat:enterprise_linux_eus:10.0
 before 1:4.4.2-3.el10_0.2
1:4.4.2-3.el10_0.2
wireshark-cli-debuginfo
Red Hat:enterprise_linux_eus:10.0
 before 1:4.4.2-3.el10_0.2
1:4.4.2-3.el10_0.2
wireshark-debuginfo
Red Hat:enterprise_linux_eus:10.0
 before 1:4.4.2-3.el10_0.2
1:4.4.2-3.el10_0.2
wireshark-debugsource
Red Hat:enterprise_linux_eus:10.0
 before 1:4.4.2-3.el10_0.2
1:4.4.2-3.el10_0.2
wireshark-devel
Red Hat:enterprise_linux_eus:10.0
 before 1:4.4.2-3.el10_0.2
1:4.4.2-3.el10_0.2
wireshark
Rocky Linux:10
 before 1:4.4.2-4.el10_1.2
1:4.4.2-4.el10_1.2
wireshark
SUSE:Linux Enterprise Module for Basesystem 15 SP6
 before 4.2.13-150600.18.26.1
4.2.13-150600.18.26.1
wireshark
SUSE:Linux Enterprise Module for Basesystem 15 SP7
 before 4.2.13-150600.18.26.1
4.2.13-150600.18.26.1
wireshark
SUSE:Linux Enterprise Module for Desktop Applications 15 SP6
 before 4.2.13-150600.18.26.1
4.2.13-150600.18.26.1
wireshark
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7
 before 4.2.13-150600.18.26.1
4.2.13-150600.18.26.1
wireshark
openSUSE:Leap 15.6
 before 4.2.13-150600.18.26.1
4.2.13-150600.18.26.1
libvirt
SUSE:Linux Enterprise Module for Basesystem 15 SP7
From an advisory covering 18 CVEs
 before 11.0.0-150700.4.19.1
11.0.0-150700.4.19.1
wireshark
SUSE:Linux Enterprise Module for Basesystem 15 SP7
From an advisory covering 18 CVEs
 before 4.6.4-150700.21.8.1
4.6.4-150700.21.8.1
wireshark
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7
From an advisory covering 18 CVEs
 before 4.6.4-150700.21.8.1
4.6.4-150700.21.8.1
libvirt
SUSE:Linux Enterprise Module for Server Applications 15 SP7
From an advisory covering 18 CVEs
 before 11.0.0-150700.4.19.1
11.0.0-150700.4.19.1
wireshark
SUSE:Linux Enterprise Server 16.0
From an advisory covering 8 CVEs
 before 4.4.13-160000.1.1
4.4.13-160000.1.1
wireshark
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 8 CVEs
 before 4.4.13-160000.1.1
4.4.13-160000.1.1
wireshark
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.10.2-11.10.3-11.10.5-1ubuntu11.10.5-21.10.6-1
Show 9 moreShow less
1.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.12.6.3-1~ubuntu14.04.12.6.4-2~ubuntu14.04.12.6.5-1~ubuntu14.04.12.6.6-1~ubuntu14.04.02.6.8-1~ubuntu14.04.0~esm12.6.10-1~ubuntu14.04.0~esm12.6.10-1~ubuntu14.04.0~esm22.6.10-1~ubuntu14.04.0~esm3
 None known
wireshark
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.12.7+g7fc8978-11.12.8+g5b6e543-22.0.1+g59ea380-3build12.0.2+ga16e22e-12.2.6+g32dac6a-2ubuntu0.16.04
Show 8 moreShow less
2.6.3-1~ubuntu16.04.12.6.4-2~ubuntu16.04.02.6.5-1~ubuntu16.04.02.6.6-1~ubuntu16.04.02.6.8-1~ubuntu16.04.02.6.10-1~ubuntu16.04.02.6.10-1~ubuntu16.04.0+esm12.6.10-1~ubuntu16.04.0+esm2
 None known
wireshark
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.4.2-12.4.3-12.4.4-12.4.5-12.6.3-1~ubuntu18.04.1
Show 7 moreShow less
2.6.4-2~ubuntu18.04.02.6.5-1~ubuntu18.04.02.6.6-1~ubuntu18.04.02.6.8-1~ubuntu18.04.02.6.10-1~ubuntu18.04.02.6.10-1~ubuntu18.04.0+esm12.6.10-1~ubuntu18.04.0+esm2
 None known
wireshark
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
3.0.5-13.0.7-13.2.1-13.2.2-13.2.3-13.2.3-1ubuntu0.1~esm13.2.3-1ubuntu0.1~esm2
 None known
wireshark
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
3.4.7-1~exp13.4.9-13.6.2-1ubuntu13.6.2-23.6.2-2ubuntu0.1~esm1
 None known
wireshark
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.0.8-14.0.10-14.0.11-14.2.0-14.2.2-14.2.2-1.1build14.2.2-1.1build24.2.2-1.1build3
 None known
wireshark
Ubuntu:25.10
 All versions, plus listed versions
4.4.5-14.4.6-24.4.6-2build14.4.7-1
 None known
wireshark
Ubuntu:26.04:LTS
 All versions, plus listed versions
4.4.7-14.6.0-14.6.1-24.6.2-34.6.3-14.6.4-1
 None known
wireshark
openSUSE:Tumbleweed
 before 4.4.9-2.1
4.4.9-2.1
wireshark
openSUSE:Leap 16.0
From an advisory covering 8 CVEs
 before 4.4.13-160000.1.1
4.4.13-160000.1.1

History

History
RecordedChangedSources
affected
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2025-9817 is a high vulnerability (CVSS 7.8) in Wireshark, published September 3, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 10th percentile. Fixed in wireshark 1:4.4.2-4.el10_1.2.

References

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