Back to the CVE list
CVE-2026-57191

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

CVSS score

8.2

EPSS probability

—

Risk score

0.8

Published

2 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

Checking session…

Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-57191: Asterisk MWI NOTIFY Message-Account Parsing Stack Buffer Overflow

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

An unbounded sscanf during MWI NOTIFY Message-Account parsing in Asterisk versions can lead to a stack buffer overflow. This allows an unauthenticated attacker to permanently disable SIP functionality over the network.

Why does it matter?

This vulnerability enables unauthenticated attackers to remotely crash SIP functionality permanently, disrupting telephony services and threatening operational continuity.

What should be done?

  • Follow the vendor advisory to apply updates
  • Apply the relevant patches and versions
  • Execute service restart procedures where necessary
Chain of evidence and sources3 verified claims

Asterisk res_pjsip_pubsub bileşenindeki sınırsız sscanf, yığın tampon taşmasına neden olabilir.

S0 · daybreach-canonicalS1 · cvelist

Saldırgan kimliği doğrulanmamış bir şekilde özel hazırlanmış paket göndererek SIP işlevselliğini kalıcı olarak devre dışı bırakabilir.

S0 · daybreach-canonicalS1 · cvelist

Tam işleyişi yeniden tesis etmek için bir Asterisk yeniden başlatması gereklidir.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

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.

CVSS vector: 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

CWE: CWE-120, CWE-787

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-57191 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1asteriskasterisk View
2asteriskcertified-asterisk View
Total affected vendors: 1|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
8.2CVSS V40HIGHCVSS: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:XNVD
8.2CVSS V4_0HIGHCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-57191 is associated with the following CWEs:

CWE-120: Common Weakness Enumeration Entry CWE-120CWE-787: Out-of-bounds Write

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-57191 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://github.com/asterisk/asterisk/security/advisories/GHSA-589g-qgf8-m6mxvendor-advisoryhttps://github.com/asterisk/asterisk/commit/0e89514084490070c5ecee419ec5ee37b7c49528vendor-advisoryhttps://github.com/asterisk/asterisk/commit/647b35c3cfd4a2cc3b1fb7560b085feba5c24b4bvendor-advisoryhttps://github.com/asterisk/asterisk/commit/7a1ffcdf38cc76d1c4eae51651667f3fd4548ab0vendor-advisoryhttps://github.com/asterisk/asterisk/commit/b4be3bd67ce4ac35b94fbfa860cdd9e1c906610bvendor-advisoryhttps://github.com/asterisk/asterisk/commit/b5281828dad7d44658439ba6393fe6be3328a4bdvendor-advisoryhttps://github.com/asterisk/asterisk/commit/dca516f6d895e8867d48fa56b6ce7f05b6f7457avendor-advisoryhttps://github.com/asterisk/asterisk/commit/ee1b66a5e40733ba0b9fad7fc4d032cabbe1dd75vendor-advisoryhttps://github.com/asterisk/asterisk/releases/tag/20.20.1vendor-advisoryhttps://github.com/asterisk/asterisk/releases/tag/21.12.3vendor-advisory

CVSS Vector Radar Chart

8.2 / 10
Attack VectorNetworkComplexityHighPrivilegesNoneUser Interact.NoneConfidentialityHighIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

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
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)High
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

A
asterisk logo
asterisk

Weakness Type (CWE & CAPEC)

CWE-120 CWE-787

Similar Vulnerabilities

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

Get a free keyDocumentation
curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-57191"
CVE-2026-57191 · Asterisk: Stack buffer overflow in MWI…