7.5

CVE-2018-6829: gnupg libgcrypt

CVSS: 7.5v3.0HighModified
AliasesDEBIAN-CVE-2018-6829
Published 07-02-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-6829 is a high (CVSS 7.5) vulnerability in gnupg libgcrypt. EPSS estimates a 1.78% chance of exploitation in the next 30 days, higher than 77.8% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
40/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
1.78%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Timeline

  1. 07-02-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.78%

Chance of exploitation in the next 30 days

Percentile

78%

Versus all other CVEs

30-day change

+0.02 pp

From 1.76% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.78%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Attack On Libgcrypt Elgamal

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • gnupg1All versions (No fix recorded)
  • libgcrypt20All versions (No fix recorded)
Gnupg1 product

2 vendors · 3 products

References

5 links