synced 14 MIN AGO
01 Record

CVE-2021-25219

Lame cache can be abused to severely degrade resolver performance

MediumPUBLISHEDCNA: isc
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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02 Description

Lame cache can be abused to severely degrade resolver performance

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
11.15% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 95.9% of scored records. A rank, not a probability.
NVD base score
5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-10-27 21:10Z5 YR AGO
Last updated
2024-09-16 17:33Z2 YR AGO
Reserved
2021-01-15
Assigning CNA
isc
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
  • CWE-20Improper Input ValidationClass
Data version
5.1
Document digest
da1a2628cd3b94f5b64b15e47db071a800fd1deda96299b0df8f0bc480913b6f

05 Affected products

VendorProductVersionsPlatforms
ISCBIND9Open Source Branches 9.3 through 9.11 9.3.0 through versions before 9.11.36, Open Source Branches 9.12 through 9.16 9.12.0 through versions before 9.16.22, Supported Preview Branches 9.9-S through 9.11-S 9.9.3-S1 through versions before 9.11.36-S1, Supported Preview Branch 9.16-S 9.16.8-S1 through versions before 9.16.22-S1, Development Branch 9.17 9.17.0 through versions before 9.17.19—

06 References

07 Remediation

Upgrade to the patched release most closely related to your current version of BIND: BIND 9.11.36, BIND 9.16.22, BIND 9.17.19, or for BIND Supported Preview Edition (a special feature preview branch of BIND provided to eligible ISC support customers): BIND 9.11.36-S1, BIND 9.16.22-S1.

08 Fixed in

AlmaLinux 8

  • bind
    Fixed in 32:9.11.36-3.el8
  • bind-chroot
    Fixed in 32:9.11.36-3.el8
  • bind-devel
    Fixed in 32:9.11.36-3.el8
  • bind-export-devel
    Fixed in 32:9.11.36-3.el8
  • bind-export-libs
    Fixed in 32:9.11.36-3.el8
  • bind-libs
    Fixed in 32:9.11.36-3.el8
  • bind-libs-lite
    Fixed in 32:9.11.36-3.el8
  • bind-license
    Fixed in 32:9.11.36-3.el8
  • bind-lite-devel
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11-devel
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11-libs
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11-utils
    Fixed in 32:9.11.36-3.el8
  • bind-sdb
    Fixed in 32:9.11.36-3.el8
  • bind-sdb-chroot
    Fixed in 32:9.11.36-3.el8
  • bind-utils
    Fixed in 32:9.11.36-3.el8
  • python3-bind
    Fixed in 32:9.11.36-3.el8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • bind
    Fixed in 9.16.22-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • bind
    Fixed in 32:9.11.36-3.el8
  • bind-chroot
    Fixed in 32:9.11.36-3.el8
  • bind-devel
    Fixed in 32:9.11.36-3.el8
  • bind-export-devel
    Fixed in 32:9.11.36-3.el8
  • bind-export-libs
    Fixed in 32:9.11.36-3.el8
  • bind-libs
    Fixed in 32:9.11.36-3.el8
  • bind-libs-lite
    Fixed in 32:9.11.36-3.el8
  • bind-license
    Fixed in 32:9.11.36-3.el8
  • bind-lite-devel
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11-devel
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11-libs
    Fixed in 32:9.11.36-3.el8
  • bind-pkcs11-utils
    Fixed in 32:9.11.36-3.el8
  • bind-sdb
    Fixed in 32:9.11.36-3.el8
  • bind-sdb-chroot
    Fixed in 32:9.11.36-3.el8
  • bind-utils
    Fixed in 32:9.11.36-3.el8
  • python3-bind
    Fixed in 32:9.11.36-3.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • bind9
    Fixed in 1:9.17.19-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • bind9
    Fixed in 1:9.17.19-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • bind9
    Fixed in 1:9.17.19-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • bind9
    Fixed in 1:9.11.3+dfsg-1ubuntu1.16

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • bind9
    Fixed in 1:9.16.1-0ubuntu2.9

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • bind9
    Fixed in 1:9.16.15-1ubuntu2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • bind9
    Fixed in 1:9.9.5.dfsg-3ubuntu0.19+esm5
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • bind9
    Fixed in 1:9.10.3.dfsg.P4-8ubuntu1.19+esm1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.