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01 Record

CVE-2021-3672

A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
2.81% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 86.3% of scored records. A rank, not a probability.
NVD base score
5.6 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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
2021-11-23 00:00Z4 YR AGO
Last updated
2024-10-15 17:14Z2 YR AGO
Reserved
2021-07-30
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
Data version
5.1
Document digest
a80d561d58bc03caa32f28c6ff6a9c60450c83d15b28d391ab9238f6b93b44bc

05 Affected products

VendorProductVersionsPlatforms
n/ac-aresc-ares 1.17.2—

06 References

07 Fixed in

AlmaLinux 8

  • c-ares
    Fixed in 1.13.0-6.el8
  • c-ares-devel
    Fixed in 1.13.0-6.el8
  • nodejs
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:12.22.5-1.module_el8.5.0+85+79a7b441
  • nodejs-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:12.22.5-1.module_el8.5.0+85+79a7b441
  • nodejs-docs
    Fixed in 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
  • nodejs-full-i18n
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:12.22.5-1.module_el8.5.0+85+79a7b441
  • nodejs-nodemon
    Fixed in 2.0.3-1.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging
    Fixed

    A version is affected if any line below covers it.

    • Affected before 17-3.module_el8.3.0+2023+d2377ea3
    • Affected before 17-3.module_el8.4.0+2224+b07ac28e
    • Affected before 17-3.module_el8.4.0+2521+c668cc9f
    • Affected before 23-3.module_el8.4.0+2522+3bd42762
    • Affected before 23-3.module_el8.5.0+254+b4526b16
  • npm
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:6.14.14-1.12.22.5.1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:6.14.14-1.12.22.5.1.module_el8.5.0+85+79a7b441

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

Arch Linux

  • c-ares
    Fixed in 1.17.2-1

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

CloudLinux 8

  • c-ares
    Fixed in 1.13.0-6.el8
  • c-ares-devel
    Fixed in 1.13.0-6.el8
  • nodejs
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:12.22.5-1.module_el8.5.0+85+79a7b441
  • nodejs-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:12.22.5-1.module_el8.5.0+85+79a7b441
  • nodejs-docs
    Fixed in 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
  • nodejs-full-i18n
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:12.22.5-1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:12.22.5-1.module_el8.5.0+85+79a7b441
  • nodejs-nodemon
    Fixed in 2.0.3-1.module_el8.4.0+2521+c668cc9f
  • nodejs-packaging
    Fixed

    A version is affected if any line below covers it.

    • Affected before 17-3.module_el8.3.0+2023+d2377ea3
    • Affected before 17-3.module_el8.4.0+2224+b07ac28e
    • Affected before 17-3.module_el8.4.0+2521+c668cc9f
    • Affected before 23-3.module_el8.4.0+2522+3bd42762
    • Affected before 23-3.module_el8.5.0+254+b4526b16
  • npm
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:6.14.14-1.12.22.5.1.module_el8.4.0+2529+af52a4c7
    • Affected before 1:6.14.14-1.12.22.5.1.module_el8.5.0+85+79a7b441

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

  • c-ares
    Fixed in 1.17.1-1.1

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

Debian 13

  • c-ares
    Fixed in 1.17.1-1.1

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

Debian 14

  • c-ares
    Fixed in 1.17.1-1.1

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

Ubuntu 18.04 LTS

  • c-ares
    Fixed in 1.14.0-1ubuntu0.1

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

Ubuntu 20.04 LTS

  • c-ares
    Fixed in 1.15.0-1ubuntu0.1

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

Ubuntu 22.04 LTS

  • c-ares
    Fixed in 1.17.1-1ubuntu1

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

Ubuntu Pro 16.04 LTS

  • c-ares
    Fixed in 1.10.0-3ubuntu0.2+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.