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CVE-2026-57191

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

No known exploitation. EPSS puts it in the 48th percentile. No fix published yet.

CVSS —Not scoredEPSS percentile48th0.6% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixNone yetNo fix or workaround published

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

No fixed build or workaround is published yet. Limit exposure and watch for a patch.

  • AsteriskAffected: < 20.20.1Upgrade to: not statedAffected: >= 21.0.0-pre1, < 21.12.3Upgrade to: not statedAffected: >= 22.0.0-pre1, < 22.10.1Upgrade to: not statedAffected: >= 23.0.0-pre1, < 23.4.1Upgrade to: not statedStated by: CVE record
  • Asterisk Certified-asteriskAffected: < 20.7-cert11Upgrade to: not statedAffected: >= 22.8-cert1-pre1, < 22.8-cert3Upgrade to: not statedStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS48th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.6% chance of exploitation activity in the next 30 days, which ranks it in the 48th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

6 events over 105 days, from the signal feeds we watch.

  1. Record updated
  2. Publishedweakness classified, att&ck mapped, record updated
  3. OpenVAS check added

Affected products

Technical detail

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 12 more references. See all after sign-in

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We'll flag the next CVE, public exploit or patch for Asterisk, not every advisory.