Description
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, the DHCP parser in rust/src/dhcp/dhcp.rs creates stateless transactions without recording their packet direction with AppLayerTxData::for_direction(), so a sensor that observes only one direction cannot mark the unseen direction inspected or free completed transactions. The RDP parser in rust/src/rdp/rdp.rs has the same direction-state defect. The per-flow transaction list can grow without bound and cleanup repeatedly scans it, causing increasing CPU and memory consumption and eventual denial of service. This issue is fixed in version 8.0.6.
Affected products
oisf: suricata
References8
- github.com/OISF/suricata/security/advisories/GHSA-m2vc-g65c-ph7m MitigationVendor Advisory
- github.com/OISF/suricata/commit/3f86c56c800392ede5cfaf7a944a431… Patch
- github.com/OISF/suricata/commit/5af13e3eb06be0387da8703b611c5ce… Patch
- github.com/OISF/suricata/commit/bac8a69ca48c14582d39a244a87edad… Patch
- github.com/OISF/suricata/commit/ef035c7603293a10c5ad087e3d20b05… Patch
- github.com/OISF/suricata/pull/15740 Patch
- github.com/OISF/suricata/releases/tag/suricata-8.0.6 Release Notes
- redmine.openinfosecfoundation.org/issues/8621 Permissions Required
Metrics
- CVSS 3.1
-
6.5
MEDIUM
Score source: CNA
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 35 · as of 8 November 2026
- CWE
- CWE-400CWE-770
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