Is CVE-2020-8492 in the CISA KEV catalog?

No. CVE-2020-8492 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-8492?

CVE-2020-8492 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2020-8492?

CVE-2020-8492 has an EPSS score of 6.62% (93th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-8492?

Upgrade python2.7 on debian 11 to 2.7.18-2 or later. Fixes are available for 23 affected products.

CVE & CISA-KEV Catalog

CVE-2020-8492

MEDIUMEPSS 93th pctl

6.5

CVSS v3

NVD

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.

CWE-400Resource Exhaustion

How to fix

Remediation Available

python2.7Debian

Fixed in:2.7.18-2CVE-2020-8492

libpython3.7-stdlibUbuntu

Fixed in:3.7.5-2ubuntu1~18.04.2USN-5200-1

libpython3.8-stdlibUbuntu

Fixed in:3.8.0-3ubuntu1~18.04.2USN-5200-1

python2.7Ubuntu

Fixed in:2.7.6-8ubuntu0.6+esm5USN-4333-1

Fixed in:2.7.12-1ubuntu0~16.04.11USN-4333-1

Fixed in:2.7.17-1~18.04ubuntu1USN-4333-1

Fixed in:2.7.18-1~20.04.1USN-4754-3

python2.7-minimalUbuntu

Fixed in:2.7.6-8ubuntu0.6+esm5USN-4333-1

Fixed in:2.7.12-1ubuntu0~16.04.11USN-4333-1

Fixed in:2.7.17-1~18.04ubuntu1USN-4333-1

Fixed in:2.7.18-1~20.04.1USN-4754-3

python3.10Ubuntu

Fixed in:3.10.12-1~22.04.4USN-6891-1

python3.10-minimalUbuntu

Fixed in:3.10.12-1~22.04.4USN-6891-1

python3.11Ubuntu

Fixed in:3.11.0~rc1-1~22.04.1~esm1USN-6891-1

Fixed in:3.11.6-3ubuntu0.1USN-6891-1

python3.11-minimalUbuntu

Fixed in:3.11.0~rc1-1~22.04.1~esm1USN-6891-1

Fixed in:3.11.6-3ubuntu0.1USN-6891-1

python3.12Ubuntu

Fixed in:3.12.0-1ubuntu0.1USN-6891-1

python3.12-minimalUbuntu

Fixed in:3.12.0-1ubuntu0.1USN-6891-1

python3.4Ubuntu

Fixed in:3.4.3-1ubuntu1~14.04.7+esm6USN-4333-1

python3.4-minimalUbuntu

Fixed in:3.4.3-1ubuntu1~14.04.7+esm6USN-4333-1

python3.5Ubuntu

Fixed in:3.5.2-2ubuntu0~16.04.4~14.04.1+esm1USN-6891-1

Fixed in:3.5.2-2ubuntu0~16.04.10USN-4333-1

Fixed in:3.5.2-2ubuntu0~16.04.13+esm13USN-6891-1

python3.5-minimalUbuntu

Fixed in:3.5.2-2ubuntu0~16.04.4~14.04.1+esm1USN-6891-1

Fixed in:3.5.2-2ubuntu0~16.04.10USN-4333-1

Fixed in:3.5.2-2ubuntu0~16.04.13+esm13USN-6891-1

python3.6Ubuntu

Fixed in:3.6.9-1~18.04ubuntu1.13+esm2USN-6891-1

Fixed in:3.6.9-1~18.04ubuntu1USN-4333-1

python3.6-minimalUbuntu

Fixed in:3.6.9-1~18.04ubuntu1.13+esm2USN-6891-1

Fixed in:3.6.9-1~18.04ubuntu1USN-4333-1

python3.7Ubuntu

Fixed in:3.7.5-2ubuntu1~18.04.2+esm3USN-6891-1

Fixed in:3.7.5-2ubuntu1~18.04.2USN-5200-1

Fixed in:3.7.5-2~18.04.4USN-4754-3

python3.7-minimalUbuntu

Fixed in:3.7.5-2~18.04.4USN-4754-3

Fixed in:3.7.5-2ubuntu1~18.04.2+esm3USN-6891-1

Fixed in:3.7.5-2ubuntu1~18.04.2USN-5200-1

python3.8Ubuntu

Fixed in:3.8.0-3ubuntu1~18.04.2USN-5200-1

Fixed in:3.8.0-3~18.04.1USN-4754-3

Fixed in:3.8.0-3ubuntu1~18.04.2+esm2USN-6891-1

Fixed in:3.8.2-1ubuntu1.1USN-4333-2

Fixed in:3.8.10-0ubuntu1~20.04.10USN-6891-1

python3.8-minimalUbuntu

Fixed in:3.8.0-3ubuntu1~18.04.2+esm2USN-6891-1

Fixed in:3.8.0-3ubuntu1~18.04.2USN-5200-1

Fixed in:3.8.0-3~18.04.1USN-4754-3

Fixed in:3.8.10-0ubuntu1~20.04.10USN-6891-1

Fixed in:3.8.2-1ubuntu1.1USN-4333-2

python3.9Ubuntu

Fixed in:3.9.5-3ubuntu0~20.04.1+esm2USN-6891-1

python3.9-minimalUbuntu

Fixed in:3.9.5-3ubuntu0~20.04.1+esm2USN-6891-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

6.62%probability of exploitation in 30 days

93rdpercentile

High risk: more likely to be exploited than 93% of all known CVEs.

References

Patch1

github.com

Exploit1

python-security.readthedocs.io

Vendor Advisory1

bugs.python.org

Third-Party Advisory6

Other references7

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.