CVE-2021-26911 json
core/imap/MCIMAPSession.cpp in Canary Mail before 3.22 has Missing SSL Certificate Validation for IMAP in STARTTLS mode.
published 2021-02-17 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13695
- cvss
- 7.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
core/imap/MCIMAPSession.cpp in Canary Mail before 3.22 has Missing SSL Certificate Validation for IMAP in STARTTLS mode.
Patch / fix
Exploit prediction
1.09% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- census-labs.com https://census-labs.com/news/2021/02/17/canary-mail-app-missing-certificate-validation-check-on-imap-starttls/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
github.com
/canarymail/mailcore2/commit/45acb4efbcaa57a20ac5127dc976538671fce018
patch, third-party-advisory
-
openwall.com
/lists/oss-security/2021/02/17/3
mailing-list, patch, third-party-advisory
-
openwall.com
/lists/oss-security/2021/02/17/3
mailing-list, patch, third-party-advisory
-
census-labs.com
/news/2021/02/17/canary-mail-app-missing-certificate-validation-check-on-imap-starttls/
exploit, third-party-advisory
-
apps.apple.com
/us/app/canary-mail/id1236045954
product, third-party-advisory
-
census-labs.com
/news/category/advisories/
third-party-advisory
Sources
- CVE List CVE-2021-26911
- NVD CVE-2021-26911
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