Is CVE-2021-26717 in the CISA KEV catalog?

No. CVE-2021-26717 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26717?

CVE-2021-26717 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-26717?

CVE-2021-26717 has an EPSS score of 2.18% (80th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26717?

Upgrade asterisk on debian 11 to 1:16.16.1~dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-26717

HIGHEPSS 80th pctl

7.5

CVSS v3

NVD

Description

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

How to fix

Remediation Available

asteriskDebian

Fixed in:1:16.16.1~dfsg-1CVE-2021-26717

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

2.18%probability of exploitation in 30 days

80thpercentile

Elevated risk: more likely to be exploited than 80% of all known CVEs.

References

Patch2

Vendor Advisory2

Third-Party Advisory1

packetstormsecurity.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.