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Fencer Vulns
medium 6.5

CVE-2025-49832 json

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

published 2025-08-01 15 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-23381

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits
0
none known

Summary

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.

Patch / fix

  • asterisk certified_asterisk 18.26.3, 20.7-cert7, 20.15.1, 21.10.1, 22.5.1
  • asterisk open_source 18.26.3, 20.7-cert7, 20.15.1, 21.10.1, 22.5.1
  • digium asterisk 18.26.3, 20.7-cert7, 20.15.1, 21.10.1, 22.5.1
  • digium certified_asterisk 18.26.3, 20.7-cert7, 20.15.1, 21.10.1, 22.5.1
  • sangoma certified_asterisk 18.26.3, 20.7-cert7, 20.15.1, 21.10.1, 22.5.1
  • asterisk Debian 14 1:22.5.1~dfsg+~cs6.15.60671435-1

debian advisories DEBIAN-CVE-2025-49832

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-49832 updated cvss 6.5

asterisk: Asterisk SIP Profile Remote Code Execution

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
15 mo ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • asterisk asterisk

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.