Pgbouncer
CVE-2015-6817
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK
2 techniques across 2 tactics: Defense Evasion, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 8.1 (HIGH). Attack characteristics: network attack vector, high complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 1.37%. |
| Exploit ScenarioDerived | A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user via an unknown username. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required. This Improper Authentication vulnerability could allow attackers to bypass authentication mechanisms to gain unauthorized access.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user via an unknown username. Affected products include: Pgbouncer. Version information: before 1.6.1.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user via an unknown username.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
Affected Products (CPE)CVE.org
PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by send
Stack-based buffer overflow in PgBouncer before 1.25.2 lets a malicious or impersonated PostgreSQL backend corrupt the p
A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Se
Authentication bypass in PgBouncer 1.17.0 through 1.26.0 allows an authenticated attacker who knows a valid password for
Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNTIL value,
Arbitrary SQL execution during authentication affects PgBouncer before 1.25.1 when the non-default auth_query feature is
When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries
Unauthenticated remote attackers can render PgBouncer 1.20.0 through 1.26.0 unresponsive by sending a single crafted Sta
A crafted oversized input to the PgBouncer connection pooler (versions through 1.25.2) triggers an integer overflow in p
Unauthenticated remote attackers can crash PgBouncer through 1.25.2 by sending a malformed SCRAM client-final-message th
Remote denial-of-service in PgBouncer versions before 1.25.2 allows unauthenticated attackers to crash the connection po
Denial of service in PgBouncer before 1.25.2 lets a malicious or malfunctioning PostgreSQL backend crash the connection
Exploit-DB