Vulnerability Monitor

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CVE-2015-4054

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.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 1 product from pgbouncer organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-05-23T04:29:00.383

Last Modified

2025-04-20T01:37:25.860

Status

Deferred

Source

[email protected]

Severity

CVSSv3.0: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-476

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	pgbouncer	pgbouncer	≤ 1.5.4	Yes

References

http://www.openwall.com/lists/oss-security/2015/05/22/5 Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/74751 Third Party Advisory, VDB Entry ([email protected])
https://github.com/pgbouncer/pgbouncer/commit/74d6e5f7de5ec736f71204b7b422af7380c19ac5 Patch, Third Party Advisory ([email protected])
https://github.com/pgbouncer/pgbouncer/commit/edab5be6665b9e8de66c25ba527509b229468573 Patch, Third Party Advisory ([email protected])
https://github.com/pgbouncer/pgbouncer/issues/42 Exploit, Third Party Advisory ([email protected])
https://pgbouncer.github.io/changelog.html#pgbouncer-15x Release Notes, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/201701-24 Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2015/05/22/5 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/74751 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/pgbouncer/pgbouncer/commit/74d6e5f7de5ec736f71204b7b422af7380c19ac5 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/pgbouncer/pgbouncer/commit/edab5be6665b9e8de66c25ba527509b229468573 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/pgbouncer/pgbouncer/issues/42 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://pgbouncer.github.io/changelog.html#pgbouncer-15x Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201701-24 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For pgbouncer's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.