CVE intelligence and bounded remediation

CVE-2021-3935 — Pgbouncer Pgbouncer security vulnerability

High CVSS 8.1

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.

Severity
High
CVSS
8.1 (3.1)
Published
2021-11-22
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-89, CWE-295

Affected products

  • pgbouncer / pgbouncer
  • redhat / enterprise_linux / 7.0
  • fedoraproject / fedora / 35
  • debian / debian_linux / 9.0

Matched remediation archetype

SQL and data-query injection

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Check exposure

  • Trace request, message, file, and stored values into SQL, ORM query fragments, filters, sort expressions, and other data-query languages.
  • Inventory database roles, reachable schemas, multi-tenant boundaries, and whether stacked or administrative operations are enabled.
  • Check both direct queries and second-order use of previously stored values.

Remediate safely

  • Use parameterized queries or safe query builders for all values; map identifiers and operators through explicit allowlists.
  • Remove raw query concatenation and give the application account only the tables and operations it requires.
  • Update affected data-access components and add regression tests for query structure preservation with inert edge-case inputs.

Authoritative sources

Complete CVE record and remediation plan

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