CVE-2020-14966

Name: CVE-2020-14966
Creator: NVD / NIST
Published: 2020-06-22T12:15:10.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.12%

Last modified Jun 22, 2026

CVE-2020-14966 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.12%

61.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Kjur	Jsrsasign	<= 8.0.18
Netapp	Max Data	All versions

References

https://github.com/kjur/jsrsasign/issues/437Exploit, Issue Tracking, Third Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.17Release Notes, Third Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.18Release Notes, Third Party Advisory
https://kjur.github.io/jsrsasign/Release Notes, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200724-0001/Third Party Advisory
https://www.npmjs.com/package/jsrsasignProduct, Third Party Advisory
https://github.com/kjur/jsrsasign/issues/437Exploit, Issue Tracking, Third Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.17Release Notes, Third Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.18Release Notes, Third Party Advisory
https://kjur.github.io/jsrsasign/Release Notes, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200724-0001/Third Party Advisory
https://www.npmjs.com/package/jsrsasignProduct, Third Party Advisory

Timeline

Published: Jun 22, 2020
Last Modified: Jun 22, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14966?

How severe is CVE-2020-14966?

CVE-2020-14966 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14966?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14966?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST