Cyber Resilience

CVE-2021-26717

HighPublic PoC

Published: 18 February 2021

Published
18 February 2021
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0042 62.5th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-26717 is a high-severity an unspecified weakness vulnerability in Digium Certified Asterisk. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 37.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio…

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and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.

CWE(s)
NVD-CWE-noinfo

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

digium
asterisk
16.0.0 — 16.16.1 · 17.0.0 — 17.9.2 · 18.0 — 18.2.1
digium
certified asterisk
16.8

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References