High severity · published Feb 26, 2022
CVE-2021-3967
Improper Access Control in zulip/zulip
8.8
CVSS
0.8%
EPSS
No
On KEV
Description
Improper Access Control in GitHub repository zulip/zulip prior to 4.10.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZU
zulip/zulip · zulip
before 4.10 · source: vendor
ZU
Zulip · Zulip
before 4.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3967
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3967
Patch
https://github.com/zulip/zulip/commit/d5db254ca8167995a1654d1c45ffc74b2fade39a
Exploit
https://huntr.dev/bounties/2928a625-0467-4a0a-b4e2-e27322786686
More from zulip/zulip
5.4
CVE-2021-3866
Cross-site Scripting (XSS) - Stored in zulip/zulip