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No exploitation reportedFix available

CVE-2020-14966

No exploitation reported by the sources we read.

  • Published2020-06-22
  • Fixed in8.0.19
  • WeaknessCWE-347

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2020-06-2212:15CVE publishedNVD

Versions per branch

OSV · NVD
jsrsasign
BranchAffectedFixed in
8.0≥ 4.0.0, < 8.0.198.0.19
Kjur jsrsasign
BranchAffectedFixed in
8.0≤ 8.0.18no fix published
Netapp max data
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update jsrsasign to 8.0.19

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2020-06-22
Last Modified
2026-06-22
NVD status
Modified
GitHub Advisory
GHSA-p8c3-7rj8-q963

Frequently asked questions

What is CVE-2020-14966?

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.

Is CVE-2020-14966 actively exploited?

Active exploitation of CVE-2020-14966 has not been confirmed. Its EPSS score was 1.2% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-14966?

CVE-2020-14966 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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