CVE-2023-7008Public exploitNetwork attack vector

DNS answer manipulation via missing signature rejection

Published Dec 23, 2023 · Updated Nov 6, 2025

DNSSEC validation bypass in systemd-resolved on Red Hat Enterprise Linux 8 and 9 allows man-in-the-middle attackers to alter DNS answers. With DNSSEC=yes, the resolver accepts unsigned A or AAAA records beneath a signed zone instead of rejecting the missing RRSIG data. An on-path attacker or malicious upstream resolver can redirect applications that use the accepted answer, while the reply remains marked unauthenticated.

CVSS severity5.9
Medium
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNSSEC validation bypass in systemd-resolved on Red Hat Enterprise Linux 8 and 9 allows man-in-the-middle attackers to alter DNS answers. With DNSSEC=yes, the resolver accepts unsigned A or AAAA records beneath a signed zone instead of rejecting the missing RRSIG data. An on-path attacker or malicious upstream resolver can redirect applications that use the accepted answer, while the reply remains marked unauthenticated.

The record

CVE
CVE-2023-7008
Published
Dec 23, 2023
Updated
Nov 6, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 8
Classifications
CWE-300, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

5.9Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-300Channel Accessible by Non-Endpoint
T1557Adversary-in-the-Middle

Public exploit references

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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