BlackTreeCVE Intelligence
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Full vulnerability report · 2020
CVE-2020-7608High confidence

yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "__proto__" payload

Unknown · yargs-parser

5.3MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.51% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown yargs-parser and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcenode-yargs-parserVendor fix publishedDebian records a fixed source-package version for this release.18.1.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcenode-yargs-parserVendor fix publishedDebian records a fixed source-package version for this release.18.1.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcenode-yargs-parserVendor fix publishedDebian records a fixed source-package version for this release.18.1.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcenode-yargs-parserVendor fix publishedDebian records a fixed source-package version for this release.18.1.1-1Debian Security Tracker ↗Source updated 6 Oct 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2020-1208

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "__proto__" payload.

What

yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "__proto__" payload.

Why

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

yargs-parser could be tricked into adding or modifying properties of Object.prototype using a "__proto__" payload.

Why

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1321 ↗

CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'). The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-1321Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2023-1599IBM Security Guardium: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Security Guardium ausnutzen, um beliebigen Programmcode auszuführen, Informationen offenzulegen, Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herbeizuführen.

Official advisory ↗
BSI · German · WID-SEC-2022-2133JFrog Artifactory: Mehrere Schwachstellen in Drittanbieter-Komponenten

JFrog Artifactory nutzt verschiedene Komponenten von Drittanbietern. Diese enthalten mehrere Schwachstellen. Neuen Informationen von JFrog zufolge sind diese Schwachstellen jedoch nicht in Produkten von JFrog ausnutzbar.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20200318Security Bulletin 18 Mar 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 18 Mar 2020, published on 18 March 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2022-AVI-278Multiples vulnérabilités dans IBM Spectrum discover

ord?id=CVE-2019-19919 Référence CVE CVE-2019-20477 https://www.cve.org/CVERecord?id=CVE-2019-20477 Référence CVE CVE-2019-20920 https://www.cve.org/CVERecord?id=CVE-2019-20920 Référence CVE CVE-2019-20922 https://www.cve.org/CVERecord?id=CVE-2019-20922 Référence CVE CVE-2020-13822 https://www.cve.org/CVERecord?id=CVE-2020-13822 Référence CVE CVE-2020-14343 https://www.cve.org/CVERecord?id=CVE-2020-14343 Référence CVE CVE-2020-15366 https://www.cve.org/CVERecord?id=CVE-2020-15366 Référence CVE CVE-2020-1747 https://www.cve.org/CVERecord?id=CVE-2020-1747 Référence CVE CVE-2020-28498 https://www.cve.org/CVERecord?id=CVE-2020-28498 Référence CVE CVE-2020-7608 https://www.cve.org/CVERecord?id=CVE-2020-7608 Référence CVE CVE-2020-7660 https://www.cve.org/CVERecord?id=CVE-2020-7660 Référence CVE CVE-2020-7699 https://www.cve.org/CVERecord?id=CVE-2020-7699 Référence CVE CVE-2020-7720 https://www.cve.org/CVERecord?id=CVE-2020-7720 Référence CVE CVE-2020-7751 https://www.cve.org/CVERecord?id=CVE-2020-7751 Référence CVE CVE-2020-8116 https://www.cve.org/CVERecord?id=CVE-2020-8116 Référence CVE CVE-2021-23369 https://www.cve.org/CVERecord?id=CVE-2021-23369 Référence CVE CVE-2021-23383 https://www.cve.org/CVERecord?id=CVE-2021-23383 Référence CVE CVE-2021-3918 https://www.cve.org/CVERecord?id=CVE-2021-391

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-003028yargs-parser におけるオブジェクトプロトタイプ属性の不適切に制御された変更に関する脆弱性

yargs-parser には、オブジェクトプロトタイプ属性の不適切に制御された変更に関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
yargs-parser: All versions prior to version 18.1.1 and patches at 13.1.2 and 15.0.1
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 16 Mar 2020 · Last source change 4 Aug 2024, 09:33 UTC · CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2020-1208
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2020-1208↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2020-7608 · cve.blacktree.nl