Denial of service in Jenkins and Jenkins LTS



Published: 2021-04-22
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-28165
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Jenkins LTS
Server applications / Application servers

Jenkins
Server applications / Application servers

Vendor Jenkins

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU51876

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-28165

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when processing large TLS frames. A remote attacker can send specially crafted data to the server, trigger CPU high load and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Jenkins LTS: 1.409.1 - 2.277.2

Jenkins: 2.0 - 2.285

External links

http://jenkins.io/security/advisory/2021-04-20/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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