CVE-2021-28994
HIGHCVSS 7.5/10EPSS 2.05%
Last modified
CVE-2021-28994 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.05% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Kopano | Groupware Core | <= 8.7.16 |
| Kopano | Groupware Core | >= 9.0.0, <= 9.1.0 |
| Kopano | Groupware Core | >= 10.0.0, <= 10.0.7 |
| Kopano | Groupware Core | >= 11.0.0, <= 11.0.1 |
| Zarafa | Zarafa | >= 6.30.0, <= 7.2.6 |
References
- https://www.openwall.com/lists/oss-security/2021/04/01/1Mailing List, Third Party Advisory
- https://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
- https://www.openwall.com/lists/oss-security/2021/04/01/1Mailing List, Third Party Advisory
- https://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
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-28994?
CVE-2021-28994 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.05% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28994?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-28994?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST