CVE-2025-53538CWE-400CWE-770

Suricata's mishandling of data on HTTP2 stream 0 can lead to resource starvation

High · published July 22, 2025

CVSS v3.1
7.5
EPSS
1%
Percentile
41.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00500 · 41.9th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2025-07-22T21:36Z
EPSS history
Timeline
  • 22 JUL 21:36Z
    Suricata's mishandling of data on HTTP2 stream 0 can lead to resource starvation
    cvelistv5