CVE intelligence and bounded remediation

CVE-2021-33560 — Gnupg Libgcrypt security vulnerability

High CVSS 7.5

Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP.

Severity
High
CVSS
7.5 (3.1)
Published
2021-06-08
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-203, CWE-325

Affected products

  • gnupg / libgcrypt
  • debian / debian_linux / 9.0
  • fedoraproject / fedora / 33
  • fedoraproject / fedora / 34
  • oracle / communications_cloud_native_core_binding_support_function / 1.11.0
  • oracle / communications_cloud_native_core_network_function_cloud_native_environment / 1.9.0

Showing 6 representative product identities from 13 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Information disclosure and sensitive data exposure

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

Check exposure

  • Trace sensitive data through responses, errors, logs, metrics, traces, caches, exports, files, backups, and client bundles.
  • Identify affected subjects, tenants, retention windows, access controls, and downstream copies without opening unnecessary sensitive records.
  • Review metadata, timing, status, length, and existence signals as well as direct content disclosure.

Remediate safely

  • Minimize collection and output, apply field-level authorization and redaction at a centralized boundary, and return generic external errors.
  • Remove secrets and sensitive data from logs, artifacts, URLs, caches, and client-side bundles; rotate credentials that may have been exposed.
  • Update the affected component and add synthetic-data tests for response, error, observability, and export paths.

Authoritative sources

Complete CVE record and remediation plan

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