#VU52316 Information disclosure

Published: 2021-04-19

Vulnerability identifier: #VU52316

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-30479


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zulip Server
Web applications / Other software

Vendor: Zulip


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application in the implementation of the "all_public_streams" API feature. A remote attacker can receive message traffic to public streams that should have been only accessible to members of the organization.

Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 3.0, 3.1, 3.2, 3.3


External links

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.

Latest bulletins with this vulnerability