HOME VULNERABILITIESCVE-2020-14966

HIGH

CVE-2020-14966

CWE-347Published: June 22, 2020· Updated: Jun 22, 2026

7.5

CVSS v3.1

Official 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.

Technical Analysis

CVE-2020-14966 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Affected Vendors & Products

kjur1 product(s)

jsrsasign

netapp1 product(s)

max data

Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/kjur/jsrsasign/issues/437

ADVISORYhttps://github.com/kjur/jsrsasign/releases/tag/8.0.17

ADVISORYhttps://github.com/kjur/jsrsasign/releases/tag/8.0.18

ADVISORYhttps://kjur.github.io/jsrsasign/

ADVISORYhttps://security.netapp.com/advisory/ntap-20200724-0001/

ADVISORYhttps://www.npmjs.com/package/jsrsasign

ADVISORYhttps://github.com/kjur/jsrsasign/issues/437

ADVISORYhttps://github.com/kjur/jsrsasign/releases/tag/8.0.17

ADVISORYhttps://github.com/kjur/jsrsasign/releases/tag/8.0.18

ADVISORYhttps://kjur.github.io/jsrsasign/

ADVISORYhttps://security.netapp.com/advisory/ntap-20200724-0001/

ADVISORYhttps://www.npmjs.com/package/jsrsasign

All References (12)

→

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

Quick Facts

CVE IDCVE-2020-14966

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-347

CISA KEVNo

Affected2 vendor(s)

PublishedJun 22, 2020

Related CVEs (CWE-347)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2020-14966 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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