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CVE

CVE-2025-53538

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suric

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. In versions 7.0.10 and below and 8.0.0-beta1 through 8.0.0-rc1, mishandling of data on HTTP2 stream 0 can lead to uncontrolled memory usage, leading to loss of visibility. Workarounds include disabling the HTTP/2 parser, and using a signature like drop http2 any - any (frame:http2.hdr.

byte_test:1,=,0,3.

byte_test:4,=,0,5.

sid: 1;) where the first byte test tests the HTTP2 frame type DATA and the second tests the stream id 0. This is fixed in versions 7.0.11 and 8.0.0.

HIGH · CVSS 7.5 EPSS 0.00416
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

2
oisf suricata< 7.0.11
oisf suricataall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Jul 2025 · 10:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/OISF/suricata/commit/1d6d331752e933c46aca0ae7a9679b27462246e3Patch
https://github.com/OISF/suricata/commit/7fa88ea9e7d05e07a7864050cfd836b576669720Patch
https://github.com/OISF/suricata/security/advisories/GHSA-qrr7-crgj-cmh3PatchThird Party Advisory
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