What’s Vulnerable › Vulnerabilities

CVE-2019-17420

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-10 · updated 2026-06-17
• Weakness: CWE-459

Description

In OISF LibHTP before 0.5.31, as used in Suricata 4.1.4 and other products, an HTTP protocol parsing error causes the http_header signature to not alert on a response with a single \r\n ending.

Affected products

• OISF libhtp: before 0.5.31 — fixed in 0.5.31
• Suricata-Ids Suricata: 4.1.4

How to fix

Upgrade to a fixed version: OISF libhtp 0.5.31. Check the vendor advisory for mitigations.

References

• https://github.com/OISF/libhtp/compare/0.5.30...0.5.31
• https://github.com/OISF/libhtp/pull/213
• https://redmine.openinfosecfoundation.org/issues/2969
• https://github.com/OISF/libhtp/compare/0.5.30...0.5.31
• https://github.com/OISF/libhtp/pull/213
• https://redmine.openinfosecfoundation.org/issues/2969

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