High severity · published Jul 22, 2025
CVE-2025-53538
Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community
7.5
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SU
Suricata · Oisf
before 7.0.11; 8.0.0; 8.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-53538
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-53538
Patch
https://github.com/OISF/suricata/commit/1d6d331752e933c46aca0ae7a9679b27462246e3
Patch
https://github.com/OISF/suricata/commit/7fa88ea9e7d05e07a7864050cfd836b576669720
Patch
https://github.com/OISF/suricata/security/advisories/GHSA-qrr7-crgj-cmh3
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