CVE-2026-57198
Asterisk is an open source private branch exchange and telephony toolkit. In affected deployments, an authenticated attacker may cause a `T.140 RED` heap buffer overflow using carefully crafted packets, potentially allowing remote code execution or causing Asterisk to crash. The `chan_sip` channel driver must be installed and configured, and its `textsupport` option must be enabled; `textsupport` defaults to no. `The chan_sip driver was deprecated in Asterisk 20 and completely removed in all later versions.` Repository comparisons verify patch containment in Asterisk 20.20.1, 21.12.3, 22.10.1 and 23.4.1, and Certified Asterisk 20.7-cert11 and 22.8-cert3. The affected release-track scope remains unresolved: structured metadata includes later release tracks even though the advisory says the required `chan_sip` driver was removed there.
Executive briefing
The source record describes: Asterisk is an open source private branch exchange and telephony toolkit. In affected deployments, an authenticated attacker may cause a `T.140 RED` heap buffer overflow using carefully crafted packets, potentially allowing remote code execution or causing Asterisk to crash. The `chan_sip` channel driver must be installed and configured, and its `textsupport` option must be enabled; `textsupport` defaults to no. `The chan_sip driver was deprecated in Asterisk 20 and completely removed in all later versions.` Repository comparisons verify patch containment in Asterisk 20.20.1, 21.12.3, 22.10.1 and 23.4.1, and Certified Asterisk 20.7-cert11 and 22.8-cert3. The affected release-track scope remains unresolved: structured metadata includes later release tracks even though the advisory says the required `chan_sip` driver was removed there. 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.
Evidence confidence: Limited Evidence-derived, not an exploitability verdict
Severity & attack characteristics
CVSS vector:CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/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
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-122Affected 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/0601c33d4edf8c8f221de91cead59460fb1e7180 VENDOR security-advisories@github.com
- https://github.com/asterisk/asterisk/commit/111487298a954a029daae941eac423f0609b1261 VENDOR security-advisories@github.com
- https://github.com/asterisk/asterisk/commit/536218a86b797996e8e8844deacc8207de373701 VENDOR security-advisories@github.com
- https://github.com/asterisk/asterisk/commit/a89b61d7c756f816c7fa5327ead9e889f1531202 VENDOR security-advisories@github.com
- https://github.com/asterisk/asterisk/commit/eaa108c68a32c080d7a168ef1d8bf784d5d830f4 VENDOR security-advisories@github.com
- https://github.com/asterisk/asterisk/commit/eef894282be203cb9e6d8e9692e9c360a0b569b4 VENDOR security-advisories@github.com
- https://github.com/asterisk/asterisk/commit/fde69a1f3ff17f507a1578ae27b528f43ceb5efd 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-vfhr-r9x9-c687 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: 2026-11-04T00:32:29+00:00 · Source last modified: 2026-11-02T20:17:46.430