CVE-2018-1000807
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..
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.08%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.08% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- pyopenssl/pyopenssl · canonical/ubuntu linux · redhat/openstack · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux workstation
- Source
- cve@mitre.org
EPSS 4.1% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.