CVE-2020-10109

Exp

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.

Published: 2020-03-12 Last update: 2024-11-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-10109 is rated High Exploit Risk (82.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.33%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-10109

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-10109

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-30 3.52% 2.33% -1.19%
2 2025-12-28 2.81% 3.52% +0.71%
3 2025-12-27 — 2.81% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-10109

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2020-10109

GitHub Security Advisory for CVE-2020-10109

GHSA-p5xh-vx83-mxcj · Severity: critical · Ecosystem: pip — HTTP Request Smuggling in Twisted

OS Trackers for CVE-2020-10109

vendor priority summary link
alpine critical CVE-2020-10109: 1 source package rows (py3-twisted); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2020-10109
debian not yet assigned CVE-2020-10109 not yet assigned priority: Debian including 1 source packages (twisted), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-10109
gentoo normal CVE-2020-10109: 1 GLSA(s) (202007-24), 1 atom(s) (dev-python/twisted); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-10109
redhat high — https://access.redhat.com/security/cve/CVE-2020-10109
suse high CVE-2020-10109 severity important: SUSE including 7 source package names (matrix-synapse-1.43.0-1.1, python-Twisted, …), 30 product×package rows across 28 product lines (HPE Helion OpenStack 8, Image SLES15-SP3-BYOS-Azure, … (28 product lines)): Fixed 29, Known Not Affected 1. https://www.suse.com/security/cve/CVE-2020-10109/
ubuntu medium CVE-2020-10109 medium priority: Ubuntu including 1 source packages (twisted), 5 status rows across 5 suites (bionic, eoan, trusty, upstream, xenial): released 4, needs-triage 1. https://ubuntu.com/security/CVE-2020-10109

Affected software / configurations for CVE-2020-10109

Vendor Product Version Raw CPE
twisted twisted <= 19.10.0 cpe:2.3:a:twisted:twisted:*:*:*:*:*:*:*:*
fedoraproject fedora 31 cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
fedoraproject fedora 32 cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 19.10 cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*

References for CVE-2020-10109

cvelogic Threat Intelligence