XSS in C-Ares Project
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 Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.028 (86.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000
Affected products
- C-Ares Project
- Node.js
- Pgbouncer
- Siemens Sinec Infrastructure Network Services
- Fedoraproject Fedora — versions 33, 34
- Red Hat Enterprise Linux — versions 7.0, 7.7, 8.0
- Red Hat Enterprise Linux Computer Node — versions 1
- Red Hat Enterprise Linux Eus — versions 7.7, 8.1, 8.2
- Red Hat Enterprise Linux For IBM Z Systems — versions 8.0
- Red Hat Enterprise Linux For IBM Z Systems Eus — versions 8.1, 8.2, 8.4
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- c-ares.haxx.se/adv_20210810.html (Exploit, Patch, Vendor Advisory)
- cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf (Patch, Third Party Advisory)
- www.oracle.com/security-alerts/cpujul2022.html (Third Party Advisory)
- security.gentoo.org/glsa/202401-02 (vendor-advisory)
Frequently asked questions
- What is CVE-2021-3672?
- CVE-2021-3672 is a medium-severity vulnerability in C-Ares Project, classified under Cross-site Scripting. CVSS score: 5.6/10. Published 2021-11-23.
- How severe is CVE-2021-3672?
- Medium severity. CVSS v3 base score is 5.6 out of 10.