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CVE-2026-57203: Asterisk: Local privilege escalation through ast_loggrabber's world-writable helper location

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-29
• Weakness: CWE-426

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, `ast_loggrabber` executes a `Python script` from the world-writable `/tmp` directory. An attacker already authorized to open a shell session on the Asterisk server may place a malicious script there and gain elevated privileges or execute code when an administrator runs `ast_loggrabber` as a user with elevated privileges. 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.

Affected products

• asterisk: before 20.20.1; from 21.0.0-pre1, < 21.12.3; from 22.0.0-pre1, < 22.10.1; from 23.0.0-pre1, < 23.4.1
• asterisk certified-asterisk: before 20.7-cert11; from 22.8-cert1-pre1, < 22.8-cert3

References

• https://github.com/asterisk/asterisk/commit/022407ec47adebe27b7ec8bcf5626e5a02fe1551
• https://github.com/asterisk/asterisk/commit/a51c4e3d6bccce4bc4226c43e78952573a62f165
• https://github.com/asterisk/asterisk/commit/ba8e5bdecd5280fc0ab230df59e41ea21b3a052f
• https://github.com/asterisk/asterisk/commit/bd63fe121d0e86867863bd98b5771e592273b035
• https://github.com/asterisk/asterisk/commit/c0fc2ae54cb6289a48a80333432f5fdf5a40c7de
• https://github.com/asterisk/asterisk/commit/f18ac4c964781f671e400342790bf40679698067
• https://github.com/asterisk/asterisk/releases/tag/20.20.1
• https://github.com/asterisk/asterisk/releases/tag/21.12.3
• https://github.com/asterisk/asterisk/releases/tag/22.10.1
• https://github.com/asterisk/asterisk/releases/tag/23.4.1
• https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11
• https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3

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