Pgbouncer
CVE-2015-4054
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 3.38%. |
| Exploit ScenarioDerived | A remote attacker could crash the application by dereferencing a null pointer by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before a startup packet. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.
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 NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before a startup packet. Affected products include: Pgbouncer. Version information: before 1.5.5.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) by sending a password packet before a startup packet.
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
A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
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
PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user
Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNTIL value,
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
Untrusted search path in auth_query connection handler in PgBouncer before 1.25.1 allows an unauthenticated attacker to
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