LiveActive security incident?Get immediate response
CVE Record

CVE-2020-14966: An issue was discovered in the jsrsasign package through 8.0.18 for Node.js.

An issue was discovered in the jsrsasign package through 8.0.18 for Node.js. It allows a malleability in ECDSA signatures by not checking overflows in the length of a sequence and '0' characters appended or prepended to an integer. The modified signatures are verified as valid. This could have a security-relevant impact if an application relied on a single canonical signature.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE affects Node.js applications using jsrsasign through 8.0.18. A modified ECDSA signature could still verify as valid. The business risk is highest where systems assume one unique, canonical signature for approval, replay prevention, audit, or identity decisions.

Executive priority

Treat as a targeted dependency risk, not an internet-wide emergency. Prioritize systems where ECDSA signatures authorize access, transactions, or audit-sensitive decisions, especially if they run old jsrsasign versions.

Technical view

jsrsasign did not reject certain malformed ECDSA signature encodings involving sequence-length overflow handling and extra zero bytes around integers. As a result, altered signatures could pass verification. The CVE describes impact when an application depends on canonical signature representation, not merely signature validity.

Likely exposure

Exposure is likely limited to Node.js services or products embedding jsrsasign through version 8.0.18 and using ECDSA verification. Risk depends on whether application logic treats signature bytes as unique or canonical.

Exploitation context

The source bundle does not show KEV listing, active exploitation, public weaponization, or a CVSS score. The issue is security-relevant in specific application designs that depend on canonical ECDSA signatures.

Researcher notes

The CVE’s impact is conditional: verification accepts modified signatures, but exploitation value depends on higher-level reliance on canonical signature bytes. Sources do not provide a CVSS vector, CWE, confirmed patch version, or active exploitation evidence.

Mitigation direction

  • Inventory Node.js dependencies for jsrsasign through 8.0.18.
  • Check jsrsasign project guidance and release notes for fixed versions.
  • Review ECDSA verification flows for canonical-signature assumptions.
  • Avoid using raw signature bytes as the only uniqueness control.
  • Assess vendor exposure where products bundle jsrsasign.

Validation and detection

  • Review package manifests and lockfiles for jsrsasign versions.
  • Identify code paths that call jsrsasign ECDSA verification.
  • Check replay, audit, approval, or token logic for signature-byte comparisons.
  • Review NetApp or other vendor advisories for bundled product impact.
  • Confirm compensating controls reject non-canonical ECDSA encodings if present.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2020-14966 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.