CVE-2020-8131

Exp

Arbitrary filesystem write vulnerability in Yarn before 1.22.0 allows attackers to write to any path on the filesystem and potentially lead to arbitrary code execution by forcing the user to install a malicious package.

Published: 2020-02-24 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-8131 is rated High Exploit Risk (72.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.04%). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2020-8131

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

Exploit prediction scoring system (EPSS) score for CVE-2020-8131

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 2026-04-04 0.90% 1.04% +0.14%
2 2025-11-21 1.26% 0.90% -0.36%
3 2025-11-18 — 1.26% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-8131

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:H/PR:N/UI:R/S:U/C:H/I:H/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 5.9 [email protected]
5.1 2.0 MEDIUM
AV:N/AC:H/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 4.9 6.4 [email protected]

Weakness enumeration for CVE-2020-8131

GitHub Security Advisory for CVE-2020-8131

OS Trackers for CVE-2020-8131

vendor priority summary link
debian not yet assigned CVE-2020-8131 not yet assigned priority: Debian including 1 source packages (node-yarnpkg), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-8131
redhat medium — https://access.redhat.com/security/cve/CVE-2020-8131
suse high — https://www.suse.com/security/cve/CVE-2020-8131/
ubuntu medium CVE-2020-8131 medium priority: Ubuntu including 1 source packages (node-yarnpkg), 6 status rows across 6 suites (bionic, eoan, focal, trusty, upstream, xenial): DNE 3, ignored 1, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2020-8131

Affected software / configurations for CVE-2020-8131

Vendor Product Version Raw CPE
yarnpkg yarn <= 1.21.1 cpe:2.3:a:yarnpkg:yarn:*:*:*:*:*:*:*:*

References for CVE-2020-8131

URL Tags
https://github.com/yarnpkg/yarn/pull/7831 Patch Third Party Advisory
https://hackerone.com/reports/730239 Exploit Third Party Advisory
cvelogic Threat Intelligence