CVE-2025-53538
HIGH EPSS 34.6%
Published Jul 22, 202511mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
Published Jul 22, 2025 11mo ago
Last Modified Jun 17, 2026 2w ago
Description
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 -> 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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
34.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 2
CWE-400 Uncontrolled Resource Consumption Resource Mgmt
CWE-770
Affected Products 3
References 3
- github.com https://github.com/OISF/suricata/commit/1d6d331752e933c46aca0ae7a9679b27462246e3
- github.com https://github.com/OISF/suricata/commit/7fa88ea9e7d05e07a7864050cfd836b576669720
- github.com https://github.com/OISF/suricata/security/advisories/GHSA-qrr7-crgj-cmh3
Remediation
- github.com https://github.com/OISF/suricata/commit/1d6d331752e933c46aca0ae7a9679b27462246e3
- github.com https://github.com/OISF/suricata/commit/7fa88ea9e7d05e07a7864050cfd836b576669720
- github.com https://github.com/OISF/suricata/security/advisories/GHSA-qrr7-crgj-cmh3