CVE-2018-6829

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 1.27% Top 25%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory gnupg.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki third party advisory exploit
https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html third party advisory issue tracking
https://github.com/weikengchen/attack-on-libgcrypt-elgamal third party advisory
https://www.oracle.com/security-alerts/cpujan2020.html

Frequently Asked Questions

What is the severity of CVE-2018-6829?
CVE-2018-6829 has been scored as a high severity vulnerability.
How to fix CVE-2018-6829?
To fix CVE-2018-6829, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-6829 being actively exploited in the wild?
It is possible that CVE-2018-6829 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.