Vulnerability · Published Jul 27, 2020 · Assigned by snyk
CVE-2020-7695HTTP Response Splitting
Medium 5.3
In plain English
A medium-severity security flaw in uvicorn. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 72% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)1.4%top 27.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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 this to add arbitrary headers to HTTP responses, or even return an arbitrary response body, whenever crafted input is used to construct HTTP headers.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | python-uvicorn | 0.13.3-1 | DEBIAN-CVE-2020-7695 |
| Debian:13 | python-uvicorn | 0.13.3-1 | DEBIAN-CVE-2020-7695 |
| Debian:14 | python-uvicorn | 0.13.3-1 | DEBIAN-CVE-2020-7695 |
| PyPI | uvicorn | 0.11.7 | GHSA-f97h-2pfx-f59f |
| PyPI | uvicorn | 0.11.7 | PYSEC-2020-151 |
| Ubuntu:22.04:LTS | python-uvicorn | no fix listed | UBUNTU-CVE-2020-7695 |
| Ubuntu:24.04:LTS | python-uvicorn | no fix listed | UBUNTU-CVE-2020-7695 |
| Ubuntu:25.10 | python-uvicorn | no fix listed | UBUNTU-CVE-2020-7695 |
| Ubuntu:26.04:LTS | python-uvicorn | no fix listed | UBUNTU-CVE-2020-7695 |
| Ubuntu:26.10 | python-uvicorn | no fix listed | UBUNTU-CVE-2020-7695 |
Affected products (as reported)
References
- https://github.com/encode/uvicorn x_refsource_MISC
- https://snyk.io/vuln/SNYK-PYTHON-UVICORN-570471 x_refsource_MISC