CVE-2020-36420

** UNSUPPORTED WHEN ASSIGNED ** Polipo through 1.1.1 allows denial of service via a reachable...

7.5 High

Polipo through 1.1.1, when NDEBUG is omitted, allows denial of service via a reachable assertion during parsing of a malformed Range header. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.90%Up 0.9 points since Jul 15, 2021

What each source reports

NVD Score used 7.5

Record: CVE-2020-36420
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-617
Updated: 2026-11-02

CVE List No score

Record: CVE-2020-36420
Updated: 2026-11-02

EUVDEUVD-2020-23948 No score

Record: EUVD-2020-23948
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5hfj-73cx-942m 7.5

** UNSUPPORTED WHEN ASSIGNED ** Polipo through 1.1.1 allows denial of service via a reachable...

** UNSUPPORTED WHEN ASSIGNED ** Polipo through 1.1.1 allows denial of service via a reachable assertion during parsing of a malformed Range header. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Record: GHSA-5hfj-73cx-942m
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-617
Updated: 2026-11-02

OSV 7.5

Record: CVE-2020-36420
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-36420 7.5

Record: UBUNTU-CVE-2020-36420
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

polipo project polipo

Affected packages

Affected packages
Package	Affected	Fixed
`polipo` Ubuntu:16.04:LTS	All versions, plus listed versions 1.1.1-7	None known
`polipo` Ubuntu:18.04:LTS	All versions, plus listed versions 1.1.1-71.1.1-8	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-36420 is a high vulnerability (CVSS 7.5) in Polipo Project Polipo, published July 14, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.90%, the 79th percentile. No source names a fixed version.