CVE intelligence and bounded remediation

CVE-2021-3999 — A flaw was found in glibc

High CVSS 7.8

A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.

Severity
High
CVSS
7.8 (3.1)
Published
2022-08-24
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-193

Affected products

  • gnu / glibc
  • debian / debian_linux / 10.0
  • debian / debian_linux / 11.0
  • netapp / e-series_performance_analyzer
  • netapp / nfs_plug-in
  • netapp / ontap_select_deploy_administration_utility

Showing 6 representative product identities from 12 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Command, code, expression, and template injection

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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