Vulnerability Monitor

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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 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.

Security Impact Summary

CVE-2011-1926 is a security vulnerability that . Impacting 1 product from cmu organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2011, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2011-05-23T22:55:01.490

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 5.1 (MEDIUM)

CVSSv2 Vector

AV:N/AC:H/Au:N/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: HIGH
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

4.9

Impact Score

6.4

Weaknesses

Type: Primary
CWE-264

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cmu	cyrus_imap_server	≤ 2.4.6	Yes
Application	cmu	cyrus_imap_server	2.0.17	Yes
Application	cmu	cyrus_imap_server	2.1.16	Yes
Application	cmu	cyrus_imap_server	2.1.17	Yes
Application	cmu	cyrus_imap_server	2.1.18	Yes
Application	cmu	cyrus_imap_server	2.2.8	Yes
Application	cmu	cyrus_imap_server	2.2.9	Yes
Application	cmu	cyrus_imap_server	2.2.10	Yes
Application	cmu	cyrus_imap_server	2.2.11	Yes
Application	cmu	cyrus_imap_server	2.2.12	Yes
Application	cmu	cyrus_imap_server	2.2.13	Yes
Application	cmu	cyrus_imap_server	2.2.13p1	Yes
Application	cmu	cyrus_imap_server	2.3.0	Yes
Application	cmu	cyrus_imap_server	2.3.1	Yes
Application	cmu	cyrus_imap_server	2.3.2	Yes
Application	cmu	cyrus_imap_server	2.3.3	Yes
Application	cmu	cyrus_imap_server	2.3.4	Yes
Application	cmu	cyrus_imap_server	2.3.5	Yes
Application	cmu	cyrus_imap_server	2.3.6	Yes
Application	cmu	cyrus_imap_server	2.3.7	Yes
Application	cmu	cyrus_imap_server	2.3.8	Yes
Application	cmu	cyrus_imap_server	2.3.9	Yes
Application	cmu	cyrus_imap_server	2.3.10	Yes
Application	cmu	cyrus_imap_server	2.3.11	Yes
Application	cmu	cyrus_imap_server	2.3.12	Yes
Application	cmu	cyrus_imap_server	2.3.13	Yes
Application	cmu	cyrus_imap_server	2.3.14	Yes
Application	cmu	cyrus_imap_server	2.3.15	Yes
Application	cmu	cyrus_imap_server	2.3.16	Yes
Application	cmu	cyrus_imap_server	2.4.0	Yes
Application	cmu	cyrus_imap_server	2.4.1	Yes
Application	cmu	cyrus_imap_server	2.4.2	Yes
Application	cmu	cyrus_imap_server	2.4.3	Yes
Application	cmu	cyrus_imap_server	2.4.4	Yes
Application	cmu	cyrus_imap_server	2.4.5	Yes

References

http://bugzilla.cyrusimap.org/show_bug.cgi?id=3423 Patch ([email protected])
http://bugzilla.cyrusimap.org/show_bug.cgi?id=3424 Patch ([email protected])
http://git.cyrusimap.org/cyrus-imapd/patch/?id=523a91a5e86c8b9a27a138f04a3e3f2d8786f162 Patch ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061374.html ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061415.html ([email protected])
http://openwall.com/lists/oss-security/2011/05/17/15 Patch ([email protected])
http://openwall.com/lists/oss-security/2011/05/17/2 Patch ([email protected])
http://secunia.com/advisories/44670 ([email protected])
http://secunia.com/advisories/44876 ([email protected])
http://secunia.com/advisories/44913 ([email protected])
http://secunia.com/advisories/44928 ([email protected])
http://www.cyrusimap.org/docs/cyrus-imapd/2.4.7/changes.php ([email protected])
http://www.debian.org/security/2011/dsa-2242 ([email protected])
http://www.debian.org/security/2011/dsa-2258 ([email protected])
http://www.kb.cert.org/vuls/id/555316 US Government Resource ([email protected])
http://www.mandriva.com/security/advisories?name=MDVSA-2011:100 ([email protected])
http://www.redhat.com/support/errata/RHSA-2011-0859.html ([email protected])
http://www.securitytracker.com/id?1025625 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=705288 Patch ([email protected])
https://exchange.xforce.ibmcloud.com/vulnerabilities/67867 ([email protected])
http://bugzilla.cyrusimap.org/show_bug.cgi?id=3423 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://bugzilla.cyrusimap.org/show_bug.cgi?id=3424 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://git.cyrusimap.org/cyrus-imapd/patch/?id=523a91a5e86c8b9a27a138f04a3e3f2d8786f162 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061374.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061415.html (af854a3a-2127-422b-91ae-364da2661108)
http://openwall.com/lists/oss-security/2011/05/17/15 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://openwall.com/lists/oss-security/2011/05/17/2 Patch (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44670 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44876 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44913 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/44928 (af854a3a-2127-422b-91ae-364da2661108)
http://www.cyrusimap.org/docs/cyrus-imapd/2.4.7/changes.php (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2011/dsa-2242 (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2011/dsa-2258 (af854a3a-2127-422b-91ae-364da2661108)
http://www.kb.cert.org/vuls/id/555316 US Government Resource (af854a3a-2127-422b-91ae-364da2661108)
http://www.mandriva.com/security/advisories?name=MDVSA-2011:100 (af854a3a-2127-422b-91ae-364da2661108)
http://www.redhat.com/support/errata/RHSA-2011-0859.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id?1025625 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=705288 Patch (af854a3a-2127-422b-91ae-364da2661108)
https://exchange.xforce.ibmcloud.com/vulnerabilities/67867 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cmu's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.