CVE-2018-1000807

Name: CVE-2018-1000807
Creator: NVD / NIST
Published: 2018-10-08T15:29:00.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 4.08%

Last modified Jun 17, 2026

CVE-2018-1000807 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. EPSS estimates a 4.08% chance of exploitation in the next 30 days.

Description

Python Cryptographic Authority pyopenssl version prior to version 17.5.0 contains a CWE-416: Use After Free vulnerability in X509 object handling that can result in Use after free can lead to possible denial of service or remote code execution.. This attack appear to be exploitable via Depends on the calling application and if it retains a reference to the memory.. This vulnerability appears to have been fixed in 17.5.0.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

4.08%

89.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Pyopenssl	Pyopenssl	< 17.5.0
Canonical	Ubuntu Linux	16.04
Redhat	Openstack	13
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Workstation	7.0

References

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.htmlMailing List, Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0085Third Party Advisory
https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509
https://github.com/pyca/pyopenssl/pull/723Patch, Third Party Advisory
https://usn.ubuntu.com/3813-1/Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00014.htmlMailing List, Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:0085Third Party Advisory
https://github.com/pyca/pyopenssl/commit/e73818600065821d588af475b024f4eb518c3509
https://github.com/pyca/pyopenssl/pull/723Patch, Third Party Advisory
https://usn.ubuntu.com/3813-1/Third Party Advisory

Timeline

Published: Oct 8, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1000807?

How severe is CVE-2018-1000807?

CVE-2018-1000807 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 4.08% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1000807?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1000807?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST