CVE-2021-26911
HIGHCVSS 7.4/10EPSS 1.09%
Last modified
CVE-2021-26911 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. core/imap/MCIMAPSession.cpp in Canary Mail before 3.22 has Missing SSL Certificate Validation for IMAP in STARTTLS mode.. EPSS estimates a 1.09% chance of exploitation in the next 30 days.
Description
core/imap/MCIMAPSession.cpp in Canary Mail before 3.22 has Missing SSL Certificate Validation for IMAP in STARTTLS mode.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canarymail | Canary Mail | 3.20 |
| Canarymail | Canary Mail | 3.21 |
| Libmailcore | Mailcore2 | 0.6.4 |
References
- http://www.openwall.com/lists/oss-security/2021/02/17/3Mailing List, Patch, Third Party Advisory
- https://apps.apple.com/us/app/canary-mail/id1236045954Product, Third Party Advisory
- https://census-labs.com/news/2021/02/17/canary-mail-app-missing-certificate-validation-check-on-imap-starttls/Exploit, Third Party Advisory
- https://census-labs.com/news/category/advisories/Third Party Advisory
- https://github.com/canarymail/mailcore2/commit/45acb4efbcaa57a20ac5127dc976538671fce018Patch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/02/17/3Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/02/17/3Mailing List, Patch, Third Party Advisory
- https://apps.apple.com/us/app/canary-mail/id1236045954Product, Third Party Advisory
- https://census-labs.com/news/2021/02/17/canary-mail-app-missing-certificate-validation-check-on-imap-starttls/Exploit, Third Party Advisory
- https://census-labs.com/news/category/advisories/Third Party Advisory
- https://github.com/canarymail/mailcore2/commit/45acb4efbcaa57a20ac5127dc976538671fce018Patch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/02/17/3Mailing List, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-26911?
core/imap/MCIMAPSession.cpp in Canary Mail before 3.22 has Missing SSL Certificate Validation for IMAP in STARTTLS mode.
How severe is CVE-2021-26911?
CVE-2021-26911 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.
How do I fix CVE-2021-26911?
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-2021-26911?
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Scan your code nowSource: NVD / NIST