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CVE-2011-1926
The STARTTLS implementation in Cyrus IMAP Server before 2.4.7 does not properly restrict I/O buffering, which allows man-in-the-middle…
Medium5.1EPSS 4.0%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
The STARTTLS implementation in Cyrus IMAP Server before 2.4.7 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.1 | AV:N/AC:H/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 4.0% · top 9.5% of all CVEs (3 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.1.
Weakness
Affected products
n/a
- affected n/a
References (20)
- RHSA-2011:0859 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- FEDORA-2011-7217 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- DSA-2258 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- http://www.cyrusimap.org/docs/cyrus-imapd/2.4.7/changes.php (opens in a new tab)x_refsource_CONFIRMx_transferred
- MDVSA-2011:100 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
- FEDORA-2011-7193 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- 1025625 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- http://bugzilla.cyrusimap.org/show_bug.cgi?id=3423 (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-2242 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 44876 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- [oss-security] 20110517 CVE Request -- Cyrus-IMAP STARTTLS issue -- [was: Re: pure-ftpd STARTTLS command injection / new CVE?] (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- VU#555316 (opens in a new tab)third-party-advisoryx_refsource_CERT-VNx_transferred
- 44928 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 44913 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://bugzilla.cyrusimap.org/show_bug.cgi?id=3424 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 44670 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=705288 (opens in a new tab)x_refsource_CONFIRMx_transferred
- cyrus-starttls-command-exec(67867) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- http://git.cyrusimap.org/cyrus-imapd/patch/?id=523a91a5e86c8b9a27a138f04a3e3f2d8786f162 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [oss-security] 20110517 Re: CVE Request -- Cyrus-IMAP STARTTLS issue -- [was: Re: pure-ftpd STARTTLS command injection / new CVE?] (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2011-1926)Record last updated .