CVE-2013-4242

GnuPG before 1.4.14, and Libgcrypt before 1.5.3 as used in GnuPG 2.0.x and possibly other products, allows local users to obtain private RSA keys via a cache side-channel attack involving the L3 cache, aka Flush+Reload.

Published: 2013-08-19 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-4242 is rated Low Risk (16.7/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.09%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-4242

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-04 0.16% 0.09% -0.06%
2 2025-08-28 0.07% 0.16% +0.09%
3 2025-03-30 — 0.07% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-4242

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
1.9 2.0 LOW
AV:L/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.4 2.9 [email protected]

Weakness enumeration for CVE-2013-4242

OS Trackers for CVE-2013-4242

vendor priority summary link
gentoo normal CVE-2013-4242: 1 GLSA(s) (201402-24), 2 atom(s) (app-crypt/gnupg, dev-libs/libgcrypt); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-4242
redhat medium — https://access.redhat.com/security/cve/CVE-2013-4242
suse medium CVE-2013-4242 severity moderate: SUSE including 67 source package names (libgcrypt, libgcrypt-cavs-1.7.3-1.3, …), 139 product×package rows across 46 product lines (SUSE Linux Enterprise Desktop 11 SP2, SUSE Linux Enterprise Desktop 11 SP3, … (46 product lines)): Fixed 101, Known Not Affected 38. https://www.suse.com/security/cve/CVE-2013-4242/
ubuntu medium CVE-2013-4242 medium priority: Ubuntu including 2 source packages (gnupg, libgcrypt11), 10 status rows across 5 suites (lucid, precise, quantal, raring, upstream): released 10. https://ubuntu.com/security/CVE-2013-4242

Affected software / configurations for CVE-2013-4242

Vendor Product Version Raw CPE
canonical ubuntu_linux 10.04 cpe:2.3:o:canonical:ubuntu_linux:10.04:-:lts:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:-:lts:*:*:*:*:*
canonical ubuntu_linux 12.10 cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
canonical ubuntu_linux 13.04 cpe:2.3:o:canonical:ubuntu_linux:13.04:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
gnupg gnupg <= 1.4.13 cpe:2.3:a:gnupg:gnupg:*:*:*:*:*:*:*:*
gnupg gnupg 0.0.0 cpe:2.3:a:gnupg:gnupg:0.0.0:-:*:*:*:*:*:*
gnupg gnupg 0.2.15 cpe:2.3:a:gnupg:gnupg:0.2.15:*:*:*:*:*:*:*
gnupg gnupg 0.2.16 cpe:2.3:a:gnupg:gnupg:0.2.16:*:*:*:*:*:*:*
gnupg gnupg 0.2.17 cpe:2.3:a:gnupg:gnupg:0.2.17:*:*:*:*:*:*:*
gnupg gnupg 0.2.18 cpe:2.3:a:gnupg:gnupg:0.2.18:*:*:*:*:*:*:*
gnupg gnupg 0.2.19 cpe:2.3:a:gnupg:gnupg:0.2.19:*:*:*:*:*:*:*
gnupg gnupg 0.3.0 cpe:2.3:a:gnupg:gnupg:0.3.0:*:*:*:*:*:*:*
gnupg gnupg 0.3.1 cpe:2.3:a:gnupg:gnupg:0.3.1:*:*:*:*:*:*:*
gnupg gnupg 0.3.2 cpe:2.3:a:gnupg:gnupg:0.3.2:*:*:*:*:*:*:*
gnupg gnupg 0.3.3 cpe:2.3:a:gnupg:gnupg:0.3.3:*:*:*:*:*:*:*
gnupg gnupg 0.3.4 cpe:2.3:a:gnupg:gnupg:0.3.4:*:*:*:*:*:*:*
gnupg gnupg 0.3.5 cpe:2.3:a:gnupg:gnupg:0.3.5:*:*:*:*:*:*:*
gnupg gnupg 0.4.0 cpe:2.3:a:gnupg:gnupg:0.4.0:*:*:*:*:*:*:*
gnupg gnupg 0.4.1 cpe:2.3:a:gnupg:gnupg:0.4.1:*:*:*:*:*:*:*
gnupg gnupg 0.4.3 cpe:2.3:a:gnupg:gnupg:0.4.3:*:*:*:*:*:*:*
gnupg gnupg 0.4.4 cpe:2.3:a:gnupg:gnupg:0.4.4:*:*:*:*:*:*:*
gnupg gnupg 0.4.5 cpe:2.3:a:gnupg:gnupg:0.4.5:*:*:*:*:*:*:*
gnupg gnupg 0.9.0 cpe:2.3:a:gnupg:gnupg:0.9.0:*:*:*:*:*:*:*
gnupg gnupg 0.9.1 cpe:2.3:a:gnupg:gnupg:0.9.1:*:*:*:*:*:*:*
gnupg gnupg 0.9.2 cpe:2.3:a:gnupg:gnupg:0.9.2:*:*:*:*:*:*:*
gnupg gnupg 0.9.3 cpe:2.3:a:gnupg:gnupg:0.9.3:*:*:*:*:*:*:*
gnupg gnupg 0.9.4 cpe:2.3:a:gnupg:gnupg:0.9.4:*:*:*:*:*:*:*
gnupg gnupg 0.9.5 cpe:2.3:a:gnupg:gnupg:0.9.5:*:*:*:*:*:*:*
gnupg gnupg 0.9.6 cpe:2.3:a:gnupg:gnupg:0.9.6:*:*:*:*:*:*:*
gnupg gnupg 0.9.7 cpe:2.3:a:gnupg:gnupg:0.9.7:*:*:*:*:*:*:*
gnupg gnupg 0.9.8 cpe:2.3:a:gnupg:gnupg:0.9.8:*:*:*:*:*:*:*
gnupg gnupg 0.9.9 cpe:2.3:a:gnupg:gnupg:0.9.9:*:*:*:*:*:*:*
gnupg gnupg 0.9.10 cpe:2.3:a:gnupg:gnupg:0.9.10:*:*:*:*:*:*:*
gnupg gnupg 0.9.11 cpe:2.3:a:gnupg:gnupg:0.9.11:*:*:*:*:*:*:*
gnupg gnupg 1.0.0 cpe:2.3:a:gnupg:gnupg:1.0.0:*:*:*:*:*:*:*
gnupg gnupg 1.0.1 cpe:2.3:a:gnupg:gnupg:1.0.1:*:*:*:*:*:*:*
gnupg gnupg 1.0.2 cpe:2.3:a:gnupg:gnupg:1.0.2:*:*:*:*:*:*:*
gnupg gnupg 1.0.3 cpe:2.3:a:gnupg:gnupg:1.0.3:*:*:*:*:*:*:*
gnupg gnupg 1.0.4 cpe:2.3:a:gnupg:gnupg:1.0.4:*:*:*:*:*:*:*
gnupg gnupg 1.0.4 cpe:2.3:a:gnupg:gnupg:1.0.4:-:win32:*:*:*:*:*
gnupg gnupg 1.0.5 cpe:2.3:a:gnupg:gnupg:1.0.5:*:*:*:*:*:*:*
gnupg gnupg 1.0.5 cpe:2.3:a:gnupg:gnupg:1.0.5:-:win32:*:*:*:*:*
gnupg gnupg 1.0.6 cpe:2.3:a:gnupg:gnupg:1.0.6:*:*:*:*:*:*:*
gnupg gnupg 1.0.7 cpe:2.3:a:gnupg:gnupg:1.0.7:*:*:*:*:*:*:*
gnupg gnupg 1.2.0 cpe:2.3:a:gnupg:gnupg:1.2.0:*:*:*:*:*:*:*
gnupg gnupg 1.2.1 cpe:2.3:a:gnupg:gnupg:1.2.1:*:*:*:*:*:*:*
gnupg gnupg 1.2.1 cpe:2.3:a:gnupg:gnupg:1.2.1:windows:*:*:*:*:*:*
gnupg gnupg 1.2.2 cpe:2.3:a:gnupg:gnupg:1.2.2:*:*:*:*:*:*:*
gnupg gnupg 1.2.3 cpe:2.3:a:gnupg:gnupg:1.2.3:*:*:*:*:*:*:*
gnupg gnupg 1.2.4 cpe:2.3:a:gnupg:gnupg:1.2.4:*:*:*:*:*:*:*
gnupg gnupg 1.2.5 cpe:2.3:a:gnupg:gnupg:1.2.5:*:*:*:*:*:*:*
gnupg gnupg 1.2.6 cpe:2.3:a:gnupg:gnupg:1.2.6:*:*:*:*:*:*:*
gnupg gnupg 1.2.7 cpe:2.3:a:gnupg:gnupg:1.2.7:*:*:*:*:*:*:*
gnupg gnupg 1.3.0 cpe:2.3:a:gnupg:gnupg:1.3.0:*:*:*:*:*:*:*
gnupg gnupg 1.3.1 cpe:2.3:a:gnupg:gnupg:1.3.1:*:*:*:*:*:*:*
gnupg gnupg 1.3.2 cpe:2.3:a:gnupg:gnupg:1.3.2:*:*:*:*:*:*:*
gnupg gnupg 1.3.3 cpe:2.3:a:gnupg:gnupg:1.3.3:*:*:*:*:*:*:*
gnupg gnupg 1.3.4 cpe:2.3:a:gnupg:gnupg:1.3.4:*:*:*:*:*:*:*
gnupg gnupg 1.3.6 cpe:2.3:a:gnupg:gnupg:1.3.6:*:*:*:*:*:*:*
gnupg gnupg 1.3.90 cpe:2.3:a:gnupg:gnupg:1.3.90:*:*:*:*:*:*:*
gnupg gnupg 1.3.91 cpe:2.3:a:gnupg:gnupg:1.3.91:*:*:*:*:*:*:*
gnupg gnupg 1.3.92 cpe:2.3:a:gnupg:gnupg:1.3.92:*:*:*:*:*:*:*
gnupg gnupg 1.3.93 cpe:2.3:a:gnupg:gnupg:1.3.93:*:*:*:*:*:*:*
gnupg gnupg 1.4.0 cpe:2.3:a:gnupg:gnupg:1.4.0:*:*:*:*:*:*:*
gnupg gnupg 1.4.10 cpe:2.3:a:gnupg:gnupg:1.4.10:*:*:*:*:*:*:*
gnupg gnupg 1.4.11 cpe:2.3:a:gnupg:gnupg:1.4.11:*:*:*:*:*:*:*
gnupg gnupg 1.4.12 cpe:2.3:a:gnupg:gnupg:1.4.12:*:*:*:*:*:*:*
gnupg gnupg 2.0.1 cpe:2.3:a:gnupg:gnupg:2.0.1:*:*:*:*:*:*:*
gnupg gnupg 2.0.3 cpe:2.3:a:gnupg:gnupg:2.0.3:*:*:*:*:*:*:*
gnupg gnupg 2.0.4 cpe:2.3:a:gnupg:gnupg:2.0.4:*:*:*:*:*:*:*
gnupg gnupg 2.0.5 cpe:2.3:a:gnupg:gnupg:2.0.5:*:*:*:*:*:*:*
gnupg gnupg 2.0.6 cpe:2.3:a:gnupg:gnupg:2.0.6:*:*:*:*:*:*:*
gnupg gnupg 2.0.7 cpe:2.3:a:gnupg:gnupg:2.0.7:*:*:*:*:*:*:*
gnupg gnupg 2.0.8 cpe:2.3:a:gnupg:gnupg:2.0.8:*:*:*:*:*:*:*
gnupg gnupg 2.0.10 cpe:2.3:a:gnupg:gnupg:2.0.10:*:*:*:*:*:*:*
gnupg gnupg 2.0.11 cpe:2.3:a:gnupg:gnupg:2.0.11:*:*:*:*:*:*:*
gnupg gnupg 2.0.12 cpe:2.3:a:gnupg:gnupg:2.0.12:*:*:*:*:*:*:*
gnupg gnupg 2.0.13 cpe:2.3:a:gnupg:gnupg:2.0.13:*:*:*:*:*:*:*

References for CVE-2013-4242

URL Tags
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717880
http://eprint.iacr.org/2013/448
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
http://lists.gnupg.org/pipermail/gnupg-announce/2013q3/000330.html
http://lists.opensuse.org/opensuse-updates/2013-08/msg00003.html Vendor Advisory
http://rhn.redhat.com/errata/RHSA-2013-1457.html
http://secunia.com/advisories/54318 Vendor Advisory
http://secunia.com/advisories/54321 Vendor Advisory
http://secunia.com/advisories/54332 Vendor Advisory
http://secunia.com/advisories/54375 Vendor Advisory
http://www.debian.org/security/2013/dsa-2730
http://www.debian.org/security/2013/dsa-2731
http://www.kb.cert.org/vuls/id/976534 US Government Resource
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.securityfocus.com/bid/61464
http://www.ubuntu.com/usn/USN-1923-1 Vendor Advisory
cvelogic Threat Intelligence