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CVE-2018-1000808

21
FAUCET Score

CVE-2018-1000808 is a memory exhaustion vulnerability in Python Cryptographic Authority pyOpenSSL versions prior to 17.5.0, specifically impacting the PKCS #12 Store. This flaw, classified as CWE-401, can lead to a Denial of Service (DoS) if memory is depleted when an application reloads certificates from a PKCS #12 store. With a CVSS score of 5.9 (Medium), this vulnerability has a network attack vector and high attack complexity, but does not require user interaction or privileges. The primary impact is high availability loss. There is no evidence of active exploitation, nor are there known public exploit codes or Metasploit/Nuclei modules available. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 17.5.0CPE matchmatch criteria
cpe:2.3:a:pyopenssl_project:pyopenssl:*:*:*:*:*:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:redhat:gluster_storage:3.0:*:*:*:*:*:*:*
13CPE matchmatch criteria
cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.90%
Probability of exploitation in next 30 days
EPSS Percentile
77.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0190 is in the 60th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (11)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: pyopensslFixed in: 17.5.0
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 13.0 (Queens)Fixed in: pyOpenSSL-0:17.5.0-1.el7ost
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat Storage 3Fixed in: pyOpenSSL
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 12 (Pike)Fixed in: pyOpenSSL
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: pyOpenSSL
redhatno patchvia redhat_api
Product: Red Hat OpenStack Platform 14 (Rocky)Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: pyOpenSSL

Vendor Advisories (2)

pipGHSA-2rcm-phc9-3945high

Pyopenssl Incorrect Memory Management

Oct 10, 2018
redhatCVE-2018-1000808Low

pyOpenSSL: Failure to release memory before removing last reference in PKCS #12 Store

Nov 29, 2017

References

lists.opensuse.org / opensuse-security-announce/2019-04/msg00014.html
access.redhat.com / errata/RHSA-2019:0085
Third Party Advisory
github.com / pyca/pyopenssl/pull/723
PatchThird Party Advisory
usn.ubuntu.com / 3813-1
Third Party Advisory