CVE-2026-75514Public exploitNetwork attack vectorHinoki check available

Security-check bypass via unverified PTR match

Published Aug 20, 2026 · Updated Aug 20, 2026

Security feature bypass in Bunkerity BunkerWeb before 1.6.13 allows remote attackers to evade rDNS-based filtering via spoofed PTR records. The blacklist.lua, greylist.lua, and antibot.lua modules trust suffix matches in IGNORE_RDNS, GREYLIST_RDNS, and ANTIBOT_IGNORE_RDNS and skip calling get_ips to verify that the claimed hostname resolves back to the client IP. Reachability requires control of a PTR record for the attacking address; the result is blacklist bypass, greylist treatment, or challenge suppression rather than direct code execution or data access.

CVSS severity5.9
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Security feature bypass in Bunkerity BunkerWeb before 1.6.13 allows remote attackers to evade rDNS-based filtering via spoofed PTR records. The blacklist.lua, greylist.lua, and antibot.lua modules trust suffix matches in IGNORE_RDNS, GREYLIST_RDNS, and ANTIBOT_IGNORE_RDNS and skip calling get_ips to verify that the claimed hostname resolves back to the client IP. Reachability requires control of a PTR record for the attacking address; the result is blacklist bypass, greylist treatment, or challenge suppression rather than direct code execution or data access.

The record

CVE
CVE-2026-75514
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
Bunkerity
Product
BunkerWeb
Classifications
CWE-350, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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?

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

  1. Affected versionversion=< 1.6.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bunkerity · BunkerWebversion=< 1.6.13

Published CVSS scores

5.9GitHub, Inc.CVSS: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-350Reliance on Reverse DNS Resolution for a Security-Critical Action
T1036Masquerading

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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