CVE-2021-31878
MediumPublic PoC
Published: 30 July 2021
Published
30 July 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.0019
40.8th percentile
Risk Priority
13
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-31878 is a medium-severity Reachable Assertion (CWE-617) vulnerability in Digium Asterisk. Its CVSS base score is 6.5 (Medium).
Operationally, ranked at the 40.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-18753
Vulnerability details
An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without SDP must be received after Asterisk has sent a BYE request.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
digium
asterisk
16.17.0, 16.18.0, 16.19.0, 18.3.0, 18.4.0
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.