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CVE-2023-47641

19
FAUCET Score

CVE-2023-47641 describes an HTTP protocol inconsistency vulnerability in aiohttp, an asynchronous HTTP client/server framework for Python. This flaw allows an attacker to bypass proxy rules and poison sockets by manipulating Content-Length and Transfer-Encoding headers, potentially leading to unauthorized access or redirection of users. With a CVSS score of 6.5 (Medium), the vulnerability has a network attack vector and low attack complexity, impacting confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.8.0CPE matchmatch criteria
cpe:2.3:a:aiohttp:aiohttp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.4LOW

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.83%
Probability of exploitation in next 30 days
EPSS Percentile
53.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0083 is in the 34th percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: aiohttpFixed in: 3.8.0

Vendor Advisories (3)

pipGHSA-xx9p-xxvh-7g8jlow

Aiohttp has inconsistent interpretation of `Content-Length` vs. `Transfer-Encoding` differing in C and Python fallbacks

Nov 14, 2023
microsoft2023-Nov/CVE-2023-47641Moderate

Inconsistent interpretation of `Content-Length` vs. `Transfer-Encoding` in aiohttp

Nov 14, 2023
redhatCVE-2023-47641Low

python-aiohttp: inconsistent interpretation of `Content-Length` vs. `Transfer-Encoding`

Nov 14, 2023

References

lists.debian.org / debian-lts-announce/2025/02/msg00002.html
github.com / aio-libs/aiohttp/commit/f016f0680e4ace6742b03a70cb0382ce86abe371
Patch
github.com / aio-libs/aiohttp/security/advisories/GHSA-xx9p-xxvh-7g8j
ExploitPatchVendor Advisory