CVE-2025-53538

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductOisf Suricata

PublishedJul 22, 2025

First seenJul 22, 2025

Weakness typeCWE-770Allocation of resources without limits CWE-400Uncontrolled resource consumption

How to fix

Update

oisf suricata7.0.11 or later

Affected products

Product	Affected versions	Fixed in
oisf suricata	v < 7.0.11, 8.0.0	7.0.11

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.