What is CVE-2020-7695?

CVE-2020-7695 is a medium-severity vulnerability in Encode Uvicorn, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.3/10. Published 2020-07-27.

How severe is CVE-2020-7695?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Encode Uvicorn

CVE-2020-7695

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.

Published 2020-07-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (70.6th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Encode Uvicorn
Uvicorn — versions 0

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

github.com/encode/uvicorn (Third Party Advisory)
snyk.io/vuln/SNYK-PYTHON-UVICORN-570471 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-7695?: CVE-2020-7695 is a medium-severity vulnerability in Encode Uvicorn, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.3/10. Published 2020-07-27.
How severe is CVE-2020-7695?: Medium severity. CVSS v3 base score is 5.3 out of 10.