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CVE-2021-41945

33
FAUCET Score

CVE-2021-41945 is a critical improper input validation vulnerability affecting Encode OSS httpx versions prior to 0.23.0, specifically within httpx.URL, httpx.Client, and related functions. This flaw carries a CVSS score of 9.1 (CRITICAL), indicating it can be exploited remotely with low complexity, potentially leading to high confidentiality and integrity impacts without user interaction. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, suggesting awareness among security professionals. It is not listed on the CISA KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.23.0CPE matchmatch criteria
cpe:2.3:a:encode:httpx:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.14%
Probability of exploitation in next 30 days
EPSS Percentile
80.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0214 is in the 69th percentile among its peer group of 36,862 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 (1)

pippatch availablevia ghsa
Product: httpxFixed in: 0.23.0

Vendor Advisories (1)

pipGHSA-h8pj-cxx2-jfg2critical

Improper Input Validation in httpx

Apr 29, 2022

References

gist.github.com / lebr0nli/4edb76bbd3b5ff993cf44f2fbce5e571
ExploitThird Party Advisory
github.com / encode/httpx
ProductThird Party Advisory
github.com / encode/httpx/discussions/1831
ExploitIssue TrackingThird Party Advisory
github.com / encode/httpx/issues/2184
ExploitIssue TrackingThird Party Advisory
github.com / encode/httpx/releases/tag/0.23.0
Release NotesThird Party Advisory