coreDNS vulnerable to Improper Restriction of Communication Channel to Intended Endpoints

published 2023-03-03 3 y ago modified 2026-09-10 1 mo ago also GHSA-ch7v-37xg-75ph , EUVD-2023-0982

cvss: 4.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

A flaw was found in coreDNS. This flaw allows a malicious user to reroute internal calls to some internal services that were accessed by the FQDN in a format of <service>.<namespace>.svc.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-2835 updated 2026-06-26 cvss 4.4

coreDNS: DNS Redirection of Internal Services

Red Hat OpenShift Container Platform 4 openshift4/ose-coredns-rhel9
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 20 mo ago (2025-03-07)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CNA	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
GitHub	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/coredns/coredns	<=1.9.3	no fix listed

Affected products

n/a coreDNS

Classification

Weakness

CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

References

bugzilla.redhat.com /show_bug.cgi?id=2118542
web, issue-tracking, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2022-2835
advisory
github.com /coredns/coredns
package

Sources

CVE List CVE-2022-2835
GitHub Advisory GHSA-ch7v-37xg-75ph
NVD CVE-2022-2835

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary