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CVE-2020-10109

30
FAUCET Score

CVE-2020-10109 describes an HTTP request splitting vulnerability in Twisted Web versions up to 19.10.0, impacting products like Canonical, Debian, FedoraProject, and Twisted itself. This critical vulnerability, rated 9.8 CVSS, allows an unauthenticated attacker to remotely manipulate HTTP requests by sending a crafted request that combines a content-length and a chunked encoding header, leading to the remainder of the request being interpreted as a pipelined request. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with over 10 mentions, indicating awareness despite a lack of media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 19.10.0CPE matchmatch criteria
cpe:2.3:a:twisted:twisted:*:*:*:*:*:*:*:*
31CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.21%
Probability of exploitation in next 30 days
EPSS Percentile
86.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0321 is in the 79th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (16)

microsoftpatch availablevia msrc
Product: cm1 python-twisted 20.3.0-1 on CBL Mariner 1.0Fixed in: 20.3.0-1
microsoftpatch availablevia msrc
Product: 17003-16820Fixed in: 20.3.0-1
microsoftpatch availablevia msrc
Product: 17004-16823Fixed in: 22.2.0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 ARMFixed in: 22.2.0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 2.0 x64Fixed in: 22.2.0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 20.3.0-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 20.3.0-1
microsoftpatch availablevia msrc
Product: cbl2 python-twisted 22.2.0-1 on CBL Mariner 2.0Fixed in: 22.2.0-1
pippatch availablevia ghsa
Product: TwistedFixed in: 20.3.0
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: python-twisted-web-0:12.1.0-7.el7_8
View patch
redhatend of lifevia redhat_api
Product: Red Hat Satellite 6Fixed in: python-twisted
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 16 (Train)Fixed in: python-twisted
redhatend of lifevia redhat_api
Product: Red Hat Satellite 6Fixed in: python-twisted-web
redhatend of lifevia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: python-twisted
redhatend of lifevia redhat_api
Product: Red Hat Ceph Storage 2Fixed in: calamari-server
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: python-twisted

Vendor Advisories (4)

microsoft2021-Jul/CVE-2020-10109

CVE-2020-10109

Jul 13, 2021
pipGHSA-p5xh-vx83-mxcjcritical

HTTP Request Smuggling in Twisted

Mar 31, 2020
redhatCVE-2020-10109Important

python-twisted: HTTP request smuggling when presented with a Content-Length and a chunked Transfer-Encoding header

Mar 11, 2020
microsoft2020-Mar/CVE-2020-10109Critical

In Twisted Web through 19.10.0 there was an HTTP request splitting vulnerability. When presented with a content-length and a chunked encoding header the content-length took precedence and the remainder of the request body was interpreted as a pipelined request.

Mar 10, 2020

References

know.bishopfox.com / advisories
ExploitThird Party Advisory
know.bishopfox.com / advisories/twisted-version-19.10.0
Release NotesThird Party Advisory
lists.debian.org / debian-lts-announce/2022/02/msg00021.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/6ISMZFZBWW4EV6ETJGXAYIXN3AT7GBPL
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/YW3NIL7VXSGJND2Q4BSXM3CFTAFU6T7D
security.gentoo.org / glsa/202007-24
Third Party Advisory
usn.ubuntu.com / 4308-1
Third Party Advisory
usn.ubuntu.com / 4308-2
Third Party Advisory