CVE-2018-6829

Name: CVE-2018-6829
Creator: NVD / NIST
Published: 2018-02-07T23:29:01.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.81%

Last modified Jun 17, 2026

CVE-2018-6829 is a vulnerability of currently unknown severity. cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for Libgcrypt's ElGamal implementation.. EPSS estimates a 1.81% chance of exploitation in the next 30 days.

Description

cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for Libgcrypt's ElGamal implementation.

Metrics

EPSS Probability

1.81%

75.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Gnupg	Libgcrypt	<= 1.8.2

References

https://github.com/weikengchen/attack-on-libgcrypt-elgamalThird Party Advisory
https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wikiExploit, Third Party Advisory
https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.htmlIssue Tracking, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2020.html
https://github.com/weikengchen/attack-on-libgcrypt-elgamalThird Party Advisory
https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wikiExploit, Third Party Advisory
https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.htmlIssue Tracking, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2020.html

Timeline

Published: Feb 7, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-6829?

How severe is CVE-2018-6829?

Severity scoring for CVE-2018-6829 is pending analysis. The EPSS model estimates a 1.81% probability of exploitation in the next 30 days.

How do I fix CVE-2018-6829?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-6829?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST