CVE-2021-3935

HIGH

Published Nov 22, 20214y ago · Modified Jun 17, 20262w ago

8.1 CVSS 3.1

High

Published Nov 22, 2021 4y ago

Last Modified Jun 17, 2026 2w ago

Description

When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of TLS certificate verification and encryption. This flaw affects PgBouncer versions prior to 1.16.1.

CVSS Details

Base Score

8.1

Exploitability

2.2

Impact

5.9

Vector string

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality High

Integrity High

Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 2

CWE-295

CWE-89 SQL Injection Injection

Affected Products 4

Vendor	Product	Version	Range
pgbouncer	pgbouncer	*	<1.16.1
redhat	enterprise_linux	7.0	any
fedoraproject	fedora	35	any
debian	debian_linux	9.0	any

References 5

pgbouncer.org http://www.pgbouncer.org/changelog.html#pgbouncer-116x

Release NotesVendor Advisory
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2021251

Issue TrackingThird Party Advisory
lists.debian.org https://lists.debian.org/debian-lts-announce/2022/02/msg00016.html

Mailing ListThird Party Advisory
lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00032.html
lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNPCV3KRDI5PLLLKADFVIOHACQJLZMLI/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.