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CVE-2018-6594

25
FAUCET Score

CVE-2018-6594 describes a critical weakness in PyCrypto's ElGamal implementation (versions through 2.6.1), where poorly generated key parameters allow attackers to decrypt ciphertext, compromising data confidentiality. This vulnerability, affecting various Canonical and Debian Linux distributions and PyCrypto itself, carries a CVSS score of 7.5 (High) due to its network-based attack vector and high impact on confidentiality. Despite its severity, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this flaw.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.6.1CPE matchmatch criteria
cpe:2.3:a:dlitz:pycrypto:*:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.07%
Probability of exploitation in next 30 days
EPSS Percentile
79.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0207 is in the 64th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (18)

redhatend of lifevia redhat_api
Product: CloudForms Management Engine 5Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Ceph Storage 1.3Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Ceph Storage 2Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Ceph Storage 3Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 6 (Juno)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Enterprise 3Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 11 (Ocata)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 12 (Pike)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 8 (Liberty)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 9 (Mitaka)Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Storage 3Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Storage Console 2Fixed in: python-crypto
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: python-crypto

Vendor Advisories (2)

pipGHSA-6528-wvf6-f6qghigh

Pycrypto generates weak key parameters

Jul 12, 2018
redhatCVE-2018-6594Moderate

python-crypto: Weak ElGamal key parameters in PublicKey/ElGamal.py allow attackers to obtain sensitive information by reading ciphertext

Feb 3, 2018

References

github.com / dlitz/pycrypto/issues/253
ExploitIssue TrackingThird Party Advisory
github.com / TElgamal/attack-on-pycrypto-elgamal
Third Party Advisory
lists.debian.org / debian-lts-announce/2018/02/msg00018.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/202007-62
usn.ubuntu.com / 3616-1
Third Party Advisory
usn.ubuntu.com / 3616-2
Third Party Advisory