CVE-2022-2795

Processing large delegations may severely degrade resolver performance

Description

By flooding the target resolver with queries exploiting this flaw an attacker can significantly impair the resolver's performance, effectively denying legitimate clients access to the DNS resolution service.

Remediation

Solution:

  • Upgrade to the patched release most closely related to your current version of BIND: BIND 9.16.33, BIND 9.18.7, BIND 9.19.5, or for BIND Supported Preview Edition (a special feature preview branch of BIND provided to eligible ISC support customers): BIND 9.16.33-S1.

Workaround:

  • No workarounds known.
5.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.40%
Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory isc.org
Affected: ISC BIND9
Published at:
Updated at:

References

Link Tags
https://kb.isc.org/docs/cve-2022-2795 patch vendor advisory
http://www.openwall.com/lists/oss-security/2022/09/21/3 mailing list third party advisory patch
https://www.debian.org/security/2022/dsa-5235 third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CV4GQWBPF7Y52J2FA24U6UMHQAOXZEF7/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MRHB6J4Z7BKH4HPEKG5D35QGRD6ANNMT/ vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YZJQNUASODNVAWZV6STKG5SD6XIJ446S/ vendor advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00007.html third party advisory mailing list
https://security.gentoo.org/glsa/202210-25 third party advisory vendor advisory
https://security.netapp.com/advisory/ntap-20241129-0002/

Frequently Asked Questions

What is the severity of CVE-2022-2795?
CVE-2022-2795 has been scored as a medium severity vulnerability.
How to fix CVE-2022-2795?
To fix CVE-2022-2795: Upgrade to the patched release most closely related to your current version of BIND: BIND 9.16.33, BIND 9.18.7, BIND 9.19.5, or for BIND Supported Preview Edition (a special feature preview branch of BIND provided to eligible ISC support customers): BIND 9.16.33-S1.
Is CVE-2022-2795 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-2795 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-2795?
CVE-2022-2795 affects ISC BIND9.
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