Security readout for executives and security teams
CVE-2021-31878 is a remote crash issue in Asterisk's PJSIP channel driver. A specially timed SIP re-INVITE without SDP, after Asterisk has sent BYE, can crash affected systems. For businesses, the main concern is voice-service disruption rather than confirmed data theft or takeover. Exposure is most likely in Asterisk deployments using PJSIP on versions earlier than 16.19.1 or 18.5.1, especially where SIP signaling is reachable from external peers. The provided affected-product metadata is incomplete, so confirm exact installed Asterisk branches and module use locally. Treat this as a service-availability risk for phone systems. Prioritize exposed or business-critical Asterisk servers first. There is no source-bundle evidence of active exploitation or data compromise, but remote crash potential can still affect customer support, operations, and emergency communications. Mitigation focus: Upgrade Asterisk to 16.19.1, 18.5.1, or a later vendor-supported release.; Review the Asterisk AST-2021-007 advisory for branch-specific vendor guidance.; Restrict SIP signaling exposure to trusted peers where operationally possible..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2021-31878 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://issues.asterisk.org/jira/browse/ASTERISK-29381CVE reference · x_refsource_MISC
- https://downloads.digium.com/pub/security/AST-2021-007.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
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