Is CVE-2021-25215 in the CISA KEV catalog?

No. CVE-2021-25215 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-25215?

CVE-2021-25215 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-25215?

CVE-2021-25215 has an EPSS score of 11.30% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-25215?

Upgrade bind9 on debian 11 to 1:9.16.15-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-25215

HIGHEPSS 95th pctl

7.5

CVSS v3

NVD

Description

In BIND 9.0.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.9.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.11 of the BIND 9.17 development branch, when a vulnerable version of named receives a query for a record triggering the flaw described above, the named process will terminate due to a failed assertion check. The vulnerability affects all currently maintained BIND 9 branches (9.11, 9.11-S, 9.16, 9.16-S, 9.17) as well as all other versions of BIND 9.

CWE-617

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.16.15-1CVE-2021-25215

bind9Ubuntu

Fixed in:1:9.9.5.dfsg-3ubuntu0.19+esm13USN-7739-1

Fixed in:1:9.10.3.dfsg.P4-8ubuntu1.19USN-4929-1

Fixed in:1:9.11.3+dfsg-1ubuntu1.15USN-4929-1

Fixed in:1:9.16.1-0ubuntu2.8USN-4929-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

11.30%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% of all known CVEs.

References

Patch2

Vendor Advisory1

kb.isc.org

Third-Party Advisory7

Other references2

Related Vulnerabilities

Other CWE-617 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-8617	High	7.5	93%	-	Fix
CVE-2020-36222	High	7.5	78%	-	Fix
CVE-2006-5779	High	7.5	75%	-	Fix
CVE-2021-27212	High	7.5	64%	-	Fix
CVE-2018-5740	High	7.5	59%	-	Fix
CVE-2023-28425	Medium	5.5	55%	-	Fix

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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.