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Fencer Intel
medium 5.9

CVE-2015-0837 json

The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitive information by leveraging timi…

published 2019-11-29 6 y ago modified 2026-06-17 4 mo ago also EUVD-2015-0850

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitive information by leveraging timing differences when accessing a pre-computed table during modular exponentiation, related to a "Last-Level Cache Side-Channel Attack."

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-2015-0837

  • 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-2015-0837

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 12, SLES 12, SLED 12 +1 more 1.6.1-16.1
  • libgcrypt SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +6 more 1.5.0-0.19.1

suse advisories SUSE-SU-2015:1511-1SUSE-SU-2015:1626-1

  • libgcrypt openSUSE Tumbleweed 1.7.3-1.3

opensuse advisories openSUSE-SU-2024:10037-1

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-2015-0837 updated cvss 1.2

libgcrypt: last-level cache 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: no fix planned “Will not fix”
  • Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    affected: 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

1.95% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • GNU Libgcrypt
  • GNU GnuPG

Classification

Weakness

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.