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Fencer Intel
high 8.2

CVE-2026-57191 json

Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing

published 4mo ago modified 9d ago also EUVD-2026-111397 , GHSA-589g-qgf8-m6mx

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository asterisk/asterisk. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
8.2
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an unbounded `sscanf` in `res_pjsip_pubsub` when parsing the `MWI NOTIFY` `Message-Account` field may allow an unauthenticated attacker to send a carefully crafted packet that causes a stack buffer overflow and corrupts the underlying transport, permanently disabling all SIP functionality. An Asterisk restart is required to restore full operation. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.

Patch / fix

  • digium certified_asterisk 20.7-cert11, 20.20.1, 21.12.3, 22.8-cert3, 22.10.1, 23.4.1
  • sangoma certified_asterisk 20.7-cert11, 20.20.1, 21.12.3, 22.8-cert3, 22.10.1, 23.4.1
  • digium asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1
  • asterisk open_source 20.20.1, 21.12.3, 22.10.1, 23.4.1
  • asterisk certified_asterisk 20.7-cert11, 20.20.1, 21.12.3, 22.8-cert3, 22.10.1, 23.4.1
  • asterisk Debian 14 1:22.10.1+dfsg+~cs6.17.60671434-1

debian advisories DEBIAN-CVE-2026-57191

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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-2026-57191 updated cvss 7.5

asterisk: Asterisk: Denial of Service via stack-based buffer overflow in res_pjsip_pubsub

  • 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
none
Automatable
yes
Technical impact
partial
Assessed
9d ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • asterisk asterisk
  • asterisk certified-asterisk

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Intel 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.

The maintainers of asterisk/asterisk published their own advisory on GitHub. Reviewed sources take precedence over it.

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