Asterisk is Vulnerable to Remote DoS and possible RCE Attacks During Memory Allocation

Description

Asterisk is an open source private branch exchange and telephony toolkit. In versions up to and including 18.26.2, between 20.00.0 and 20.15.0, 20.7-cert6, 21.00.0, 22.00.0 through 22.5.0, there is a remote DoS and possible RCE condition in `asterisk/res/res_stir_shaken /verification.c` that can be exploited when an attacker can set an arbitrary Identity header, or STIR/SHAKEN is enabled, with verification set in the SIP profile associated with the endpoint to be attacked. This is fixed in versions 18.26.3, 20.7-cert6, 20.15.1, 21.10.1 and 22.5.1.

Scores

EPSS (exploitation in 30 days)

0.53% · top 55% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

• CWE-476: NULL Pointer Dereference (opens in a new tab)All about CWE-476 and its CVEs

Affected products

• asterisk · asterisk

  • affected < 18.26.3
  • affected >= 20.00.0, < 20.15.1
  • affected >= 21.00.0, < 21.10.1
  • affected >= 22.00.0, < 22.5.1
  • affected >= 20.7-cert6, < 20.7-cert7

References (1)

• https://github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr (opens in a new tab)x_refsource_CONFIRM

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-2025-49832](https://trackcve.app/badge/CVE-2025-49832.svg)](https://trackcve.app/cve/CVE-2025-49832)

Record last updated 1 Aug 2025, 18:29 UTC.