What is CVE-2021-30479?

CVE-2021-30479 is a medium-severity vulnerability in Zulip Server, classified under Improper Privilege Management. CVSS score: 5.3/10. Published 2021-04-15.

How severe is CVE-2021-30479?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Privilege escalation in Zulip Server

CVE-2021-30479

An issue was discovered in Zulip Server before 3.4. A bug in the implementation of the all_public_streams API feature resulted in guest users being able to receive message traffic to public streams that should have been only accessible to members of the organization.

Vulnerability class: Privilege Escalation

EPSS: 0.009 (54.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Zulip Zulip_server
N/a — versions n/a

Weakness classification (CWE)

CWE-269 — Improper Privilege Management

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-30479?: CVE-2021-30479 is a medium-severity vulnerability in Zulip Server, classified under Improper Privilege Management. CVSS score: 5.3/10. Published 2021-04-15.
How severe is CVE-2021-30479?: Medium severity. CVSS v3 base score is 5.3 out of 10.