> CVE-2026-75514 [MEDIUM]

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PUBLISHED
2026-08-20 19:17
MODIFIED
2026-08-20 19:17
CVSS_SCORE V3
5.9
EPSS (Prob. Exploit)
0.60%
Top 52.5%
DATA SOURCES:
NVD 🔗 2026-08-20 CWE MITRE 🔗 2026-09-01 FIRST EPSS 🔗 2026-10-18 OSV 🔗 2026-10-26

> DESCRIPTION

BunkerWeb is an open-source, next-generation Web Application Firewall. Prior to 1.6.13, the blacklist, greylist, and antibot modules in src/common/core/blacklist/blacklist.lua, src/common/core/greylist/greylist.lua, and src/common/core/antibot/antibot.lua trust PTR suffix matches in IGNORE_RDNS, GREYLIST_RDNS, and ANTIBOT_IGNORE_RDNS without using get_ips to confirm that the hostname resolves to the client address. An unauthenticated remote attacker who controls a PTR record can spoof a trusted suffix to bypass rDNS-based blacklisting, gain greylist treatment, or skip an antibot challenge. This issue is fixed in version 1.6.13.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EXPLOITABILITY
2.2
IMPACT
3.6

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
None (N)
Aucune authentification requise
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
None (N)
Aucune divulgation d'informations
I (Impact Intégrité)
Integrity Impact
High (H)
Modification totale des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
None
Aucune divulgation d'informations
Intégrité
High
Modification totale des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-350

> CWE DETAILED DESCRIPTIONS

CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action - The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it does not properly ensure that the IP address is truly associated with the hostname.

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

BunkerWeb: rDNS bypass via missing forward-confirmation (FCrDNS) in blacklist, greylist, and antibot

AFFECTED PACKAGES:
Unknown / Unknown
33 versions affected
ALIASES:
GHSA-q54j-5484-pvjm

> HISTORIQUE DES MODIFICATIONS

Première apparition
20/08/2026 19:17
Source: NVD
📊 ENRICHISSEMENT 01/09/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action - The product performs reverse DNS resolution on an IP address to obtain the hostname and make a security decision, but it do...
Total des modifications: 1 Dernière mise à jour: 1 month ago

> REFERENCES

https://github.com/bunkerity/bunkerweb/commit/1a97e5b3f977130a1b84507a9e1f703c8e...
https://github.com/bunkerity/bunkerweb/pull/3710
https://github.com/bunkerity/bunkerweb/releases/tag/v1.6.13
https://github.com/bunkerity/bunkerweb/security/advisories/GHSA-q54j-5484-pvjm
https://github.com/bunkerity/bunkerweb/security/advisories/GHSA-q54j-5484-pvjm
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