CVE-2020-26521: The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code)

High severity · published Nov 6, 2020

CVE-2020-26521

The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code)

7.5

CVSS

2.2%

EPSS

On KEV

Description

The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).

CVSS vector

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

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)2.2% · higher than 82% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Fedora · Fedoraproject

33 · source: NVD

Nats-server · Linuxfoundation

before 2.1.9 · source: NVD

Affected product

Fedora

Fedoraproject

All Fedora CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2020-26521

CVE.org

https://www.cve.org/CVERecord?id=CVE-2020-26521

Mailing List

http://www.openwall.com/lists/oss-security/2020/11/02/2

Patch

https://github.com/nats-io/nats-server/commits/master

lists.fedoraproject.org

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SI/