CVE-2026-6507Public exploitNetwork attack vector

Daemon crash via BOOTREPLY buffer overwrite

Published Apr 17, 2026 · Updated Apr 17, 2026

Out-of-bounds write in dnsmasq on Red Hat OpenShift Container Platform 4 allows remote attackers to crash the daemon via BOOTREPLY. In rfc2131.c, BOOTREPLY handling replaces OPTION_AGENT_ID with OPTION_END and then clears option_len plus two bytes after the option, writing one byte beyond an exact-size 552-byte receive buffer. The path is reachable only when --dhcp-split-relay is enabled; the demonstrated consequence is memory corruption followed by a dnsmasq abort.

CVSS severity7.5
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in dnsmasq on Red Hat OpenShift Container Platform 4 allows remote attackers to crash the daemon via BOOTREPLY. In rfc2131.c, BOOTREPLY handling replaces OPTION_AGENT_ID with OPTION_END and then clears option_len plus two bytes after the option, writing one byte beyond an exact-size 552-byte receive buffer. The path is reachable only when --dhcp-split-relay is enabled; the demonstrated consequence is memory corruption followed by a dnsmasq abort.

The record

CVE
CVE-2026-6507
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 6
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record 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?

389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

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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-787Out-of-bounds Write
T1499.004Application or System Exploitation

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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