Evidence-led vulnerability intelligence · 2026-10-28 03:47 IST

CVE-2026-57199

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, `app_sms.c` copies externally controlled `SMS` lengths into `fixed in-struct buffers` without sufficient bounds checks, allowing an attacker to corrupt memory or crash Asterisk. The administrator must explicitly use the `SMS` dialplan application, which is useful when routing calls to or from `analog devices`, and must not have ensured that data passed to the application is valid. 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.

LOW · 2.3

Executive briefing

The source record describes: 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, `app_sms.c` copies externally controlled `SMS` lengths into `fixed in-struct buffers` without sufficient bounds checks, allowing an attacker to corrupt memory or crash Asterisk. The administrator must explicitly use the `SMS` dialplan application, which is useful when routing calls to or from `analog devices`, and must not have ensured that data passed to the application is valid. 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. The practical risk depends on whether an affected product/version is present, reachable and configured in an exploitable way. Review the affected-product evidence and linked vendor advisories before assigning exposure status.

Assessment: Potential exposure only — validate the installed product, exact version, configuration and vendor applicability before treating an asset as confirmed vulnerable.

Evidence confidence: Limited Evidence-derived, not an exploitability verdict

Severity & attack characteristics

2.3 / 10 · 4.0

CVSS vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/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

Attack vectorN

Attack complexityL

Attack requirementsP

Privileges requiredL

User interactionN

ScopeX

Technical explanation & impact

The technical mechanism is not expanded beyond the source description unless a referenced advisory supplies additional evidence. Read the linked vendor/CERT advisories for root-cause detail.

Potential impact must be interpreted from the published CVSS impact metrics and the affected component. A CVSS impact score is not proof that a particular asset is exploitable.

Weakness classification

CWE-787

Affected products and versions

NVD has not supplied machine-readable vulnerable CPE product/version entries for this CVE. This is an information gap, not proof that no products are affected. Check the vendor advisory references below.

Remediation & validation

Identify exposure by comparing the affected product and version ranges with your asset inventory, SBOM and externally exposed services.
Review the linked vendor security advisory or patch notes. Upgrade to a vendor-confirmed fixed release; do not infer a fixed version from the CVE description.
Until patched, consider restricting network access or disabling the affected feature where operationally safe. These are temporary controls, not a substitute for a vendor fix.
Validate the remediation with a version check and vulnerability rescan, then retain change evidence.

No fixed version is displayed unless it is explicitly established by a vendor advisory. Follow the vendor's release notes for exact product and branch applicability.

Vendor advisories, patches & exploit references

https://github.com/asterisk/asterisk/commit/15c66022dc441ec63d7bd5f53cf7f35db72964be VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/38a2059eb77a91a6b6e76eeba5875c2b96027368 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/59b74276f24ba104d859f3f05897c9b8d835a28a VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/60f4ef3deac6b9af30519b46c13f103264038b82 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/661d6a2fc5cc7744ab9d849ed3c73ae5066386df VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/7048a3841df99e090b9d87246600373581629c98 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/f46f63bd4d33665d336cf8b5998650b915222549 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/releases/tag/20.20.1 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/releases/tag/21.12.3 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/releases/tag/22.10.1 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/releases/tag/23.4.1 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/security/advisories/GHSA-q9fr-m7g8-6ph5 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/tree/24.0.0-pre1 VENDOR security-advisories@github.com

Information gaps & confidence notes

These gaps indicate missing source data. CVE Watch does not fill them with guessed product, exploit or patch details.

NVD does not currently provide machine-readable vulnerable CPE product/version entries for this record.

Last enrichment: 2026-11-04T13:39:38+00:00 · Source last modified: 2026-11-03T14:17:36.467

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