CVE-2020-8492
CVSS v3
6.5
MEDIUM
EPSS Score
6.6 %
exploit probability, as of 2026-10-12
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- pythonBitnamifrom 2.7.0 · fixed in 2.7.18and 2 other packages
- python38-asn1cryptoAlmaLinux:8all versions · fixed in 1.2.0-3.module_el8.6.0+2778+cd494b30
- python38-cffiAlmaLinux:8all versions · fixed in 1.13.2-3.module_el8.6.0+2778+cd494b30
- python38-chardetAlmaLinux:8all versions · fixed in 3.0.4-19.module_el8.6.0+2778+cd494b30
- python38-cryptographyAlmaLinux:8all versions · fixed in 2.8-3.module_el8.6.0+2778+cd494b30
- python38-CythonAlmaLinux:8all versions · fixed in 0.29.14-4.module_el8.6.0+2778+cd494b30
- python38-idnaAlmaLinux:8all versions · fixed in 2.8-6.module_el8.6.0+2778+cd494b30
- python38-markupsafeAlmaLinux:8all versions · fixed in 1.1.1-6.module_el8.6.0+2778+cd494b30
7 more package ranges on OSV.dev
Vendor advisories
python: wrong backtracking in urllib.request.AbstractBasicAuthHandler allows for a ReDoS
python.src as a component of Red Hat Enterprise Linux 5 · python as a component of Red Hat Enterprise Linux 6 · python-devel as a component of Red Hat Enterprise Linux 6
Siemens SIMATIC S7-1500
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
Red Hat Security Advisory: python38:3.8 security, bug fix, and enhancement update
Red Hat Security Advisory: python3 security and bug fix update
Red Hat Security Advisory: rh-python36 security, bug fix, and enhancement update
1 more advisory
Description
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
Technical details
- Published
- 2020-01-30
Frequently asked questions
What is CVE-2020-8492?
Python 2.7 through 2.7.17, 3.5 through 3.5.9, 3.6 through 3.6.10, 3.7 through 3.7.6, and 3.8 through 3.8.1 allows an HTTP server to conduct Regular Expression Denial of Service (ReDoS) attacks against a client because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
Is CVE-2020-8492 actively exploited?
Active exploitation of CVE-2020-8492 has not been confirmed. Its EPSS score was 6.6% on 2026-10-12, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2020-8492?
CVE-2020-8492 has a CVSS v3 base score of 6.5 (MEDIUM severity).
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