Evidence-led vulnerability intelligence · 2026-10-27 22:47 IST

CVE-2026-57197

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 `memcpy` of `OGG/Speex` packet data in `format_ogg_speex` can cause a heap buffer overflow and crash Asterisk when reading a file containing corrupted Speex audio. The attacker must create the file and make it available to Asterisk either through sufficiently elevated privileges or by convincing an Asterisk administrator to make it available. Asterisk must also be configured to play that file. 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.

HIGH · 7.7

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, an unbounded `memcpy` of `OGG/Speex` packet data in `format_ogg_speex` can cause a heap buffer overflow and crash Asterisk when reading a file containing corrupted Speex audio. The attacker must create the file and make it available to Asterisk either through sufficiently elevated privileges or by convincing an Asterisk administrator to make it available. Asterisk must also be configured to play that file. 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

7.7 / 10 · 4.0

CVSS vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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: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-122CWE-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/0a2c1d9e910f7c4dfffa05e328accb8a96990df8 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/0e6d761ed83f1671632c91805252767eae85e1a2 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/1cf189549994e0898954c814ce5a023cd969f1db VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/29026ece6fdd1834bb8f49c013ef163745ff2bbd VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/336ebe762bf6dfaf279796700de8ab51f7acd2f3 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/ccec146953b5e13043a36663af84e5a50ca633a6 VENDOR security-advisories@github.com
https://github.com/asterisk/asterisk/commit/dbcf38933866f0ddd023bc1814a78d4c750b0809 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-8jhw-m2hg-vp3h 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: 2026-11-04T00:32:27+00:00 · Source last modified: 2026-11-02T20:17:46.200

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