SIPp through 3.7.7 Buffer Overflow via SIP To Header Tag

Description

SIPp through 3.7.7 contains a buffer overflow vulnerability in get_peer_tag() function when processing SIP To headers with tag parameters of 2049 bytes or more. Unauthenticated remote attackers can send crafted SIP messages with oversized tag parameters to overflow the static buffer and crash the process.

Scores

EPSS (exploitation in 30 days)

0.86% · top 41% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.7.

Weakness

• CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') (opens in a new tab)All about CWE-120 and its CVEs

Affected products

• SIPp · sipp

  • affected ≤ 3.7.7

References (5)

• Pull Request #879 (opens in a new tab)patchissue-tracking
• Patch Commit (opens in a new tab)patch
• Unbounded copy in get_peer_tag() at v3.7.7 (opens in a new tab)technical-description
• https://github.com/SIPp/sipp (opens in a new tab)product
• VulnCheck Advisory: SIPp through 3.7.7 Buffer Overflow via SIP To Header Tag (opens in a new tab)third-party-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-90778](https://trackcve.app/badge/CVE-2026-90778.svg)](https://trackcve.app/cve/CVE-2026-90778)

Record last updated 24 Sept 2026, 14:21 UTC.