Is CVE-2021-25219 in the CISA KEV catalog?

No. CVE-2021-25219 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-25219?

CVE-2021-25219 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-25219?

CVE-2021-25219 has an EPSS score of 8.00% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-25219?

Upgrade bind9 on debian 11 to 1:9.16.22-1~deb11u1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-25219

MEDIUMEPSS 94th pctl

5.3

CVSS v3

NVD

Description

In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.

How to fix

Remediation Available

bind9Debian

Fixed in:1:9.16.22-1~deb11u1CVE-2021-25219

Fixed in:1:9.17.19-1CVE-2021-25219

bind9Ubuntu

Fixed in:1:9.9.5.dfsg-3ubuntu0.19+esm5USN-5126-2

Fixed in:1:9.10.3.dfsg.P4-8ubuntu1.19+esm1USN-5126-2

Fixed in:1:9.11.3+dfsg-1ubuntu1.16USN-5126-1

Fixed in:1:9.16.1-0ubuntu2.9USN-5126-1

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

AvailabilityLow

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

Exploit Intelligence

8.00%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Patch1

cert-portal.siemens.com

Vendor Advisory1

kb.isc.org

Third-Party Advisory5

Other references3

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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.