Skip to content

HTTP response splitting in uvicorn

High severity GitHub Reviewed Published Jul 29, 2020 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

pip uvicorn (pip)

Affected versions

< 0.11.7

Patched versions

0.11.7

Description

Uvicorn before 0.11.7 is vulnerable to HTTP response splitting. CRLF sequences are not escaped in the value of HTTP headers. Attackers can exploit exploit this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.

References

Published by the National Vulnerability Database Jul 27, 2020
Reviewed Jul 29, 2020
Published to the GitHub Advisory Database Jul 29, 2020
Last updated Feb 1, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS score

0.091%
(40th percentile)

Weaknesses

CVE ID

CVE-2020-7695

GHSA ID

GHSA-f97h-2pfx-f59f

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.