CVE-2018-1000807

mediumpriority · track · 33EPSS 0.041 · 91 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

4.08% (91st) EPSS

CVSS 6.8 · medium

Is it mine?

11 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

8.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.1

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.2 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USprimaryCWE-416US

affected products (11)

Products and version ranges known to be affected.

Open Source python-cryptoall versionscert_bundDEcpe:/a:python:python-crypto:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
n/a n/a≤ n/aenisa_euvdEU
canonical ubuntu linux= 16.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
pyopenssl pyopenssl< 17.5.0nvdUScpe:2.3:a:pyopenssl:pyopenssl:*:*:*:*:*:*:*:*
redhat enterprise linux desktop= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux_desktop:*:*:*:*:*:*:*:*
redhat enterprise linux server= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux_server:*:*:*:*:*:*:*:*
redhat enterprise linux workstation= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux_workstation:*:*:*:*:*:*:*:*
redhat openstack= 13nvdUScpe:2.3:a:redhat:openstack:*:*:*:*:*:*:*:*
PyPI pyopenssl< 17.5.0osvUSpkg:pypi/pyopenssl

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-1099python-crypto: Mehrere SchwachstellenDeutsch2018-12-10csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in python-crypto ausnutzen, um beliebigen Programmcode auszuführen und um einen Denial of Service Zustand herbeizuführen.
GHSA-p28m-34f6-967qPyOpenSSL Use-After-Free vulnerability2018-10-10ghsa · osvUS
It was discovered that pyOpenSSL incorrectly handled memory when handling X509 objects. A remote attacker could use this issue to cause pyOpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. This attack appears 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.
PYSEC-2018-232018-10-08vendor · osvUS
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.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund nvd NVD CVE.org MITRE

published 2018-10-08modified 2026-06-17

related (12,251)

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+12246 more

references (14)

External citations — patches, advisories, analysis.

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