8.2
HighCVSS 4.0 · from GitHub_M
CVE-2026-57191
Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing
asterisk · Buffer overflow · CWE-120Affectedasterisk, certified-asterisk
FixNo fix listed yet.
PublishedOct 27, 21:32 · GitHub_M
ScoredOct 27 · 8.2 · GitHub_M
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:06 UTC
What we know
No known exploitation. CISA KEV, checked 22:06 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker only needs network access to the target. No login needed. CVSS: network, no privileges.
It only works under certain conditions, which makes it harder to pull off. CVSS: high attack complexity.
A successful attack can take the service down. CVSS impact.
Description
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.
From GitHub_M
Affected and fixed versions
ProductAffectedFixed inasterisk< 20.20.1–asterisk>= 21.0.0-pre1, < 21.12.3–asterisk>= 22.0.0-pre1, < 22.10.1–asterisk>= 23.0.0-pre1, < 23.4.1–certified-asterisk< 20.7-cert11–certified-asterisk>= 22.8-cert1-pre1, < 22.8-cert3–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known