CVE-2021-26911

HIGH
Published Feb 17, 20215y ago · Modified Jun 17, 20262w ago
7.4 CVSS 3.1
High
Find Similar
Published Feb 17, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

core/imap/MCIMAPSession.cpp in Canary Mail before 3.22 has Missing SSL Certificate Validation for IMAP in STARTTLS mode.

CVSS Details

Base Score
7.4
Exploitability
2.2
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-295

Affected Products 3

VendorProductVersionRange
canarymailcanary_mail3.20any
canarymailcanary_mail3.21any
libmailcoremailcore20.6.4any

References 6

  • openwall.com http://www.openwall.com/lists/oss-security/2021/02/17/3
    Mailing ListPatchThird Party Advisory
  • apps.apple.com https://apps.apple.com/us/app/canary-mail/id1236045954
    ProductThird Party Advisory
  • census-labs.com https://census-labs.com/news/2021/02/17/canary-mail-app-missing-certificate-validation-check-on-imap-starttls/
    ExploitThird Party Advisory
  • census-labs.com https://census-labs.com/news/category/advisories/
    Third Party Advisory
  • github.com https://github.com/canarymail/mailcore2/commit/45acb4efbcaa57a20ac5127dc976538671fce018
    PatchThird Party Advisory
  • openwall.com https://www.openwall.com/lists/oss-security/2021/02/17/3
    Mailing ListPatchThird Party Advisory

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2021/02/17/3
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/canarymail/mailcore2/commit/45acb4efbcaa57a20ac5127dc976538671fce018
    PatchThird Party Advisory
  • openwall.com https://www.openwall.com/lists/oss-security/2021/02/17/3
    Mailing ListPatchThird Party Advisory