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Vulnerability record · CVE-2020-14968 · published 22 June 2020

CVE-2020-14968: Kjur jsrsasign memory buffer overflow vulnerability

Kjur · Jsrsasign

An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending '\0' bytes to a signature (it accepts these modified signatures as valid). An attacker can abuse this behavior in an application by creating multiple valid signatures where only one signature should exist. Also, an attacker might prepend these bytes with the goal of triggering memory corruption issues.

9.8 CVSS 3.1 Critical EPSS 2.9% · top 13.8% CWE-119 · Memory buffer overflow
9.8CVSS 3.1 base score, v2 7.5
2.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
22 Jun 2026Last modified by NVD

Description

An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending '\0' bytes to a signature (it accepts these modified signatures as valid). An attacker can abuse this behavior in an application by creating multiple valid signatures where only one signature should exist. Also, an attacker might prepend these bytes with the goal of triggering memory corruption issues.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kjur/jsrsasign/issues/438 ExploitIssue TrackingThird Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.17 Release NotesThird Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.18 Release NotesThird Party Advisory
https://kjur.github.io/jsrsasign/ Release NotesThird Party Advisory
https://security.netapp.com/advisory/ntap-20200724-0001/ Third Party Advisory
https://www.npmjs.com/package/jsrsasign ProductThird Party Advisory
https://github.com/kjur/jsrsasign/issues/438 ExploitIssue TrackingThird Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.17 Release NotesThird Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/8.0.18 Release NotesThird Party Advisory
https://kjur.github.io/jsrsasign/ Release NotesThird Party Advisory
https://security.netapp.com/advisory/ntap-20200724-0001/ Third Party Advisory
https://www.npmjs.com/package/jsrsasign ProductThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-14968), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.