CVE-2015-0837: GNU Libgcrypt vulnerability

CVE-2015-0837: The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitiv...

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."

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 04:26 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw affects older Libgcrypt and GnuPG releases used for cryptographic operations. Timing differences during modular exponentiation could expose sensitive information through a cache side channel. The source bundle does not provide CVSS, confirmed exploitation, or full attack prerequisites, so urgency depends on where legacy versions still handle sensitive keys. Exposure is most likely on legacy systems still running Libgcrypt before 1.6.3 or GnuPG before 1.4.19, especially where they perform sensitive cryptographic operations. The bundle does not identify specific operating systems beyond Debian advisories or confirm affected downstream package versions. Treat this as a legacy crypto exposure cleanup item. It is not listed in KEV and has no provided evidence of active exploitation, but affected components protect sensitive material. Upgrade or retire old versions where they remain in production. Mitigation focus: Upgrade Libgcrypt to 1.6.3 or later.; Upgrade GnuPG to 1.4.19 or later.; Review Debian advisories for distribution-specific package updates..

Prepared: Jun 6, 2026, 04:48 UTC (UTC+00:00)

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

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 29, 2019, 21:10 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.htmlCVE reference · x_refsource_CONFIRM
https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.htmlCVE reference · x_refsource_CONFIRM
https://ieeexplore.ieee.org/document/7163050CVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

GNULibgcryptbefore 1.6.3Listed

GNUGnuPGbefore 1.4.19Listed

Weakness

CWE details

No CWE listed

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