CVE-2015-4054

PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (NULL pointer...

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

4.13%Up 2.8 points since Feb 4, 2022

What each source reports

NVD Score used 7.5

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.

Record: CVE-2015-4054
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-476
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2015-4054
Updated: 2026-11-02

EUVDEUVD-2015-4080 No score

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.

Record: EUVD-2015-4080
Updated: 2026-11-03

GitHub AdvisoriesGHSA-x9fq-f586-fh7x 7.5

PgBouncer before 1.5.5 allows remote attackers to cause a denial of service (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.

Record: GHSA-x9fq-f586-fh7x
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSV 7.5

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.

Record: CVE-2015-4054
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2015-4054 7.5

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.

Record: DEBIAN-CVE-2015-4054
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2015-4054 7.5

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.

Record: UBUNTU-CVE-2015-4054
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

pgbouncer

Affected packages

Affected packages
Package	Affected	Fixed
`pgbouncer` Debian:12	before 1.5.5-1	1.5.5-1
`pgbouncer` Debian:13	before 1.5.5-1	1.5.5-1
`pgbouncer` Debian:14	before 1.5.5-1	1.5.5-1

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-4054 is a high vulnerability (CVSS 7.5) in Pgbouncer, published May 23, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.13%, the 90th percentile. Fixed in pgbouncer 1.5.5-1.

References

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