CVE-2013-4576: GnuPG 1.x before 1.4.16 generates RSA keys using sequences of introductions with certain patterns that intr...

Security readout for executives and security teams

CVE-2013-4576 is an old GnuPG 1.x issue where RSA private keys could potentially be recovered through acoustic side-channel analysis during decryption. The business risk is highest where vulnerable GnuPG versions protect sensitive long-lived keys on physically accessible devices. Sources do not indicate known active exploitation or KEV listing. Exposure is limited to environments still running GnuPG 1.x before 1.4.16, especially systems performing RSA private-key decryption where an attacker could be physically nearby. Modern systems using patched distribution packages or later GnuPG versions are unlikely to be affected. Treat this as targeted-risk remediation, not internet-scale emergency response. Patch any remaining vulnerable GnuPG 1.x systems, especially those protecting high-value RSA keys. The age of the CVE lowers likely prevalence, but private-key exposure would be high impact if the vulnerable pattern still exists. Mitigation focus: Upgrade GnuPG 1.x installations to 1.4.16 or a vendor-patched package.; Use Ubuntu, Debian, Red Hat, or other vendor advisories for package-specific remediation.; Prioritize hosts holding sensitive RSA private keys or performing automated decryption..

Prepared

Jun 14, 2026, 15:13 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.