CVE-2020-36420

Exp

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

Published: 2021-07-14 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-36420 is rated High Exploit Risk (73.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.90%). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.19% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-36420

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-36420

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.71% 1.90% +1.19%
2 2025-03-30 1.38% 0.71% -0.67%
3 2025-03-29 — 1.38% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-36420

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-36420

OS Trackers for CVE-2020-36420

vendor priority summary link
ubuntu low CVE-2020-36420 low priority: Ubuntu including 1 source packages (polipo), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 13, needs-triage 3. https://ubuntu.com/security/CVE-2020-36420

Affected software / configurations for CVE-2020-36420

Vendor Product Version Raw CPE
polipo_project polipo <= 1.1.1 cpe:2.3:a:polipo_project:polipo:*:*:*:*:*:*:*:*

References for CVE-2020-36420

URL Tags
http://www.openwall.com/lists/oss-security/2021/07/18/1 Mailing List Third Party Advisory
https://bugs.gentoo.org/755896 Exploit Issue Tracking Patch Third Party Advisory
https://github.com/jech/polipo/commit/4d42ca1b5849518762d110f34b6ce2e03d6df9ec Patch Third Party Advisory
https://www.openwall.com/lists/oss-security/2020/11/18/1 Exploit Mailing List Third Party Advisory
cvelogic Threat Intelligence