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Fencer Intel
medium 4.2

CVE-2014-3591 json

Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proxi…

published 2019-11-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2014-3565

cvss
4.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proximate attackers to obtain the server's private key by determining factors using crafted ciphertext and the fluctuations in the electromagnetic field during multiplication.

Patch / fix

  • gnupg gnupg 1.4.19
  • gnupg libgcrypt 1.6.3
  • libgcrypt20 Debian 14, Debian 13, Debian 12 1.6.3-2

debian advisories DEBIAN-CVE-2014-3591

  • gnupg Ubuntu 14.04 LTS 1.4.16-1ubuntu2.3
  • libgcrypt11 Ubuntu 14.04 LTS 1.5.3-2ubuntu4.2
  • libgcrypt20 Ubuntu 14.04 LTS 1.6.1-2ubuntu1.14.04.1

ubuntu advisories UBUNTU-CVE-2014-3591

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libgcrypt SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +6 more 1.5.0-0.19.1
  • libgcrypt SLES for SAP 12, SLES 12, SLED 12 +1 more 1.6.1-13.1

suse advisories SUSE-SU-2015:1626-1SUSE-SU-2015:1179-1

  • libgcrypt openSUSE Tumbleweed 1.7.3-1.3

opensuse advisories openSUSE-SU-2024:10037-1

  • grub2 Azure Linux 3.0 2.06-25

azure linux advisories AZL-41815

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-3591 updated cvss 1.2

libgcrypt: use ciphertext blinding for Elgamal decryption (new side-channel attack)

  • Red Hat Enterprise Linux 5 gnupg, gnupg2, libgcrypt Red Hat Enterprise Linux 6 gnupg2, libgcrypt, gnupg2-smime Red Hat Enterprise Linux 7 gnupg2, libgcrypt, gnupg2-smime
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 4.2 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • GNU Libgcrypt
  • GNU GnuPG

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.