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CVE-2026-92697

FastNetMon: NetFlow v9 unbounded strlen() on interface-description field causes remote out-of-bounds read

7.5 High

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.14%Unchanged since Nov 6, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.5

FastNetMon: NetFlow v9 unbounded strlen() on interface-description field causes remote out-of-bounds read

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Record
CVE-2026-92697
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-125
Updated
2026-11-05
EUVDEUVD-2026-117873 7.5

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Record
EUVD-2026-117873
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
2026-11-06
NVD 7.5

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Record
CVE-2026-92697
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-125
Updated
2026-11-06
OSV 7.5

FastNetMon: NetFlow v9 unbounded strlen() on interface-description field causes remote out-of-bounds read

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Record
CVE-2026-92697
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-125
Updated
2026-11-07
OSVDEBIAN-CVE-2026-92697 7.5

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Record
DEBIAN-CVE-2026-92697
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
2026-11-06
OSVUBUNTU-CVE-2026-92697 7.5

FastNetMon is a high-performance DDoS detector and sensor. In version 1.2.9 and earlier, the NetFlow v9 collector calls  strlen()  on an attacker-controlled interface-description field without bounding the scan to the field’s declared length. Although fields longer than 128 bytes are excluded from this operation, an accepted field without a null terminator can cause reads beyond the field and packet buffer. An unauthenticated remote attacker who can send crafted UDP packets to the collector can trigger an out-of-bounds read and potentially crash the process, causing denial of service. No fixed release is available as of this review.

Record
UBUNTU-CVE-2026-92697
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
2026-11-07

Affected products

Affected packages

Affected packages
PackageAffectedFixed
fastnetmon
Debian:12
All versions, plus listed versions
1.2.4-21.2.4-2+deb12u11.2.5-11.2.5-21.2.5-2~bpo12+1
Show 9 moreShow less
1.2.6-11.2.6-1~bpo12+11.2.7-11.2.7-1~bpo12+11.2.8+git20250911-11.2.8+git20250911-21.2.8-11.2.8-1~bpo12+11.2.9-1
None known
fastnetmon
Debian:13
All versions, plus listed versions
1.2.8+git20250911-11.2.8+git20250911-21.2.8-11.2.9-0+deb13u11.2.9-1
None known
fastnetmon
Debian:14
All versions, plus listed versions
1.2.8+git20250911-11.2.8+git20250911-21.2.8-11.2.9-1
None known
fastnetmon
Ubuntu:18.04:LTS
All versions, plus listed versions
1.1.3+dfsg-31.1.3+dfsg-41.1.3+dfsg-6build1
None known
fastnetmon
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
1.1.4-11.1.4-1build31.1.4-1build41.1.4-1build51.1.4-1ubuntu0.1~esm1
None known
fastnetmon
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
1.2.5-11.2.6-11.2.6-1build11.2.6-1build21.2.6-1build31.2.6-1build41.2.6-1ubuntu0.1~esm1
None known
fastnetmon
Ubuntu:26.10
All versions, plus listed versions
1.2.8+git20250911-21.2.9-11.2.9-1build11.2.9-1build2
None known
fastnetmon
Ubuntu:Pro:26.04:LTS
All versions, plus listed versions
1.2.8+git20250911-11.2.8+git20250911-1build11.2.8+git20250911-1build21.2.8+git20250911-21.2.8+git20250911-2ubuntu0.1~esm1
None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
aliases, referencesOSV
affected, aliases, referencesNVD, OSV
aliases, publishedEUVD
first indexedCVE List

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

In short

CVE-2026-92697 is a high vulnerability (CVSS 7.5) in Pavel-odintsov Fastnetmon, published November 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.14%, the 66th percentile. No source names a fixed version.

References

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