CVE-2020-8492
MEDIUMCVSS 6.5/10EPSS 6.62%
Last modified
CVE-2020-8492 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 6.62% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Python | Python | >= 2.7.0, <= 2.7.17 |
| Python | Python | >= 3.5.0, <= 3.5.9 |
| Python | Python | >= 3.6.0, <= 3.6.10 |
| Python | Python | >= 3.7.0, <= 3.7.6 |
| Python | Python | >= 3.8.0, <= 3.8.1 |
| Opensuse | Leap | 15.1 |
| Canonical | Ubuntu Linux | 12.04 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.10 |
| Canonical | Ubuntu Linux | 20.04 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
| Debian | Debian Linux | 9.0 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.htmlThird Party Advisory
- https://bugs.python.org/issue39503Issue Tracking, Vendor Advisory
- https://github.com/python/cpython/pull/18284Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00011.htmlMailing List, Third Party Advisory
- https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.htmlExploit, Third Party Advisory
- https://security.gentoo.org/glsa/202005-09Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200221-0001/Third Party Advisory
- https://usn.ubuntu.com/4333-1/Third Party Advisory
- https://usn.ubuntu.com/4333-2/Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00003.htmlThird Party Advisory
- https://bugs.python.org/issue39503Issue Tracking, Vendor Advisory
- https://github.com/python/cpython/pull/18284Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00011.htmlMailing List, Third Party Advisory
- https://python-security.readthedocs.io/vuln/urllib-basic-auth-regex.htmlExploit, Third Party Advisory
- https://security.gentoo.org/glsa/202005-09Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200221-0001/Third Party Advisory
- https://usn.ubuntu.com/4333-1/Third Party Advisory
- https://usn.ubuntu.com/4333-2/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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.
How severe is CVE-2020-8492?
CVE-2020-8492 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 6.62% probability of exploitation in the next 30 days.
How do I fix CVE-2020-8492?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2020
- CVE-2020-8484Insufficient protection of the inter-process communication f…7.8
- CVE-2020-8485Insufficient protection of the inter-process communication f…7.8
- CVE-2020-8486Insufficient protection of the inter-process communication f…7.8
- CVE-2020-8487Insufficient protection of the inter-process communication f…7.8
- CVE-2020-8488Insufficient protection of the inter-process communication f…7.8
- CVE-2020-8489Insufficient protection of the inter-process communication f…7.8
- CVE-2020-8493A stored XSS vulnerability in Kronos Web Time and Attendance…4.8
- CVE-2020-8494In Kronos Web Time and Attendance (webTA) 3.8.x and later 3.…8.8
- CVE-2020-8495In Kronos Web Time and Attendance (webTA) 3.8.x and later 3.…7.5
- CVE-2020-8496In Kronos Web Time and Attendance (webTA) 4.1.x and later 4.…4.8
- CVE-2020-8497In Artica Pandora FMS through 7.42, an unauthenticated attac…5.3
- CVE-2020-8498XSS exists in the shortcode functionality of the GistPress p…5.4
Are you affected by CVE-2020-8492?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST