CVE-2021-28994
kopano-ical (formerly zarafa-ical) in Kopano Groupware Core through 8.7.16, 9.x through 9.1.0, 10.x through 10.0.7, and 11.x through 11.0.1 and Zarafa 6.30.x through 7.2.x allows memory exhaustion via long HTTP headers.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.05%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
kopano-ical (formerly zarafa-ical) in Kopano Groupware Core through 8.7.16, 9.x through 9.1.0, 10.x through 10.0.7, and 11.x through 11.0.1 and Zarafa 6.30.x through 7.2.x allows memory exhaustion via long HTTP headers.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.05% probability · 81th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- kopano/groupware core · zarafa/zarafa
- Source
- cve@mitre.org
EPSS 2.0% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.openwall.com/lists/oss-security/2021/04/01/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/04/25/1Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/03/19/6Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/04/01/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/04/25/1Mailing List, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/03/19/6Exploit, Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.