6.8

CVE-2021-3672: c-ares_project c-ares

Modified
AliasesALPINE-CVE-2021-3672MGASA-2021-0453SUSE-SU-2021:14776-1
Published 23-11-2021Last modified 15-10-2024

Vulnerability summary

CVE-2021-3672 is a medium (CVSS 6.8) vulnerability in c-ares_project c-ares. EPSS estimates a 2.81% chance of exploitation in the next 30 days, higher than 86.5% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.6, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.8/10
010
Medium · v2.0 (NVD)
EPSS score
2.81%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 22 · Related 15
MGASA-2021-0463OPENSUSE-SU-2021:1214-1OPENSUSE-SU-2021:1239-1OPENSUSE-SU-2021:1313-1OPENSUSE-SU-2021:2875-1OPENSUSE-SU-2021:2953-1

Timeline

  1. 23-11-2021
    PublishedVulnerability first disclosed.
  2. 15-10-2024
    Last modifiedVulnerability information updated.

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 Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

2.81%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.81% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (c-ares.haxx.se)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse32 products
  • c-ares&distro=SUSE Enterprise Storage 6< 1.17.1+20200724-3.14.1
  • c-ares&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS< 1.17.1+20200724-3.14.1
  • c-ares&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS< 1.17.1+20200724-3.14.1
  • c-ares&distro=SUSE Linux Enterprise High Performance Computing 15-ESPOS< 1.17.1+20200724-3.14.1
  • c-ares&distro=SUSE Linux Enterprise High Performance Computing 15-LTSS< 1.17.1+20200724-3.14.1
Redhat16 products
Alpine3 products
  • c-ares≥ 1.0.0, < 1.17.2-r0
  • nodejs< 12.22.5-r0 | < 14.17.5-r0
  • nodejs-current< 16.11.1-r0 | < 16.6.2-r0
Opensuse3 products
  • c-ares-tests&distro=openSUSE Leap 15.2< 1.17.1+20200724-lp152.2.9.1
  • c-ares&distro=openSUSE Leap 15.2< 1.17.1+20200724-lp152.2.9.1
  • c-ares&distro=openSUSE Leap 15.3< 1.17.1+20200724-3.14.1
C-ares_project1 product
Debian1 product
  • c-ares< 1.14.0-1+deb10u1 | < 1.12.0-1+deb9u2 | < 1.17.1-1.1
Fedoraproject1 product
Mageia1 product
  • c-ares< 1.17.1-1.1.mga8
Nodejs1 product
  • node.js≥ 12.0.0, ≤ 12.12.0 | ≥ 12.13.0, < 12.22.5 | ≥ 14.0.0, ≤ 14.14.0 | ≥ 14.15.0, < 14.17.5 | ≥ 16.0.0, < 16.6.2
Pgbouncer1 product
Siemens1 product
Ubuntu1 product
  • c-ares< 1.14.0-1ubuntu0.1 | < 1.15.0-1ubuntu0.1 | < 1.10.0-3ubuntu0.2+esm1 | < 1.17.1-1ubuntu1

12 vendors · 62 products

References

28 links
Show all 28 references