CVE-2022-2837Network attack vector

DNS redirection via public-TLD namespace collision

Published Mar 3, 2023 · Updated Mar 7, 2025

DNS redirection in CoreDNS Kubernetes deployments allows attackers to route public-domain lookups to attacker-controlled Services. Kubernetes search-path expansion tries names without trailing dots beneath cluster search suffixes, and a Service in a namespace named for a public TLD takes precedence over public DNS. The attacker needs permission to create the namespace and Service, and a workload must query the target name without a trailing dot.

CVSS severity6.1
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS redirection in CoreDNS Kubernetes deployments allows attackers to route public-domain lookups to attacker-controlled Services. Kubernetes search-path expansion tries names without trailing dots beneath cluster search suffixes, and a Service in a namespace named for a public TLD takes precedence over public DNS. The attacker needs permission to create the namespace and Service, and a workload must query the target name without a trailing dot.

The record

CVE
CVE-2022-2837
Published
Mar 3, 2023
Updated
Mar 7, 2025
Vendor
CoreDNS
Product
CoreDNS
Classifications
CWE-923, CWE-601, T1557
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unknown

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

CoreDNS · CoreDNSversion=unknown

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-923Improper Restriction of Communication Channel to Intended Endpoints
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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