What’s Vulnerable › Vulnerabilities

CVE-2015-0837

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-11-29 · updated 2026-06-17
• Weakness: CWE-203

Description

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."

Affected products

• Debian Linux: 7.0, 8.0
• GnuPG: before 1.4.19 — fixed in 1.4.19
• gnupg Libgcrypt: before 1.6.3 — fixed in 1.6.3

How to fix

Upgrade to a fixed version: GnuPG 1.4.19; gnupg Libgcrypt 1.6.3. Check the vendor advisory for mitigations.

References

• http://www.debian.org/security/2015/dsa-3184
• http://www.debian.org/security/2015/dsa-3185
• https://ieeexplore.ieee.org/document/7163050
• https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html
• https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html
• http://www.debian.org/security/2015/dsa-3184
• http://www.debian.org/security/2015/dsa-3185
• https://ieeexplore.ieee.org/document/7163050
• https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html
• https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html

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