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CVE-2018-1000807

27
FAUCET Score

CVE-2018-1000807 is a Use-After-Free vulnerability (CWE-416) in Python Cryptographic Authority pyOpenSSL versions prior to 17.5.0, affecting products like Canonical and Red Hat. This high-severity vulnerability (CVSS 8.1) could lead to denial of service or remote code execution, depending on the calling application's memory handling. While the attack complexity is high, it can be exploited remotely. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

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

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.08%
Probability of exploitation in next 30 days
EPSS Percentile
89.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0408 is in the 53rd percentile among its peer group of 8,914 CVEs.

Social Chatter

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

Remediation

Patch Available

Vendor Patches (7)

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
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 12 (Pike)Fixed in: pyOpenSSL
redhatend of lifevia redhat_api
Product: Red Hat Storage 3Fixed in: pyOpenSSL

Vendor Advisories (2)

pipGHSA-p28m-34f6-967qhigh

PyOpenSSL Use-After-Free vulnerability

Oct 10, 2018
redhatCVE-2018-1000807Moderate

pyOpenSSL: Use-after-free in X509 object handling

Nov 29, 2017

References

lists.opensuse.org / opensuse-security-announce/2019-04/msg00014.html
Mailing ListThird Party Advisory
access.redhat.com / errata/RHSA-2019:0085
Third Party Advisory
github.com / pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509
github.com / pyca/pyopenssl/pull/723
PatchThird Party Advisory
usn.ubuntu.com / 3813-1
Third Party Advisory