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CVE-2011-1926

19
FAUCET Score

CVE-2011-1926 describes a plaintext command injection vulnerability in the STARTTLS implementation of Cyrus IMAP Server versions prior to 2.4.7. This flaw allows man-in-the-middle attackers to inject commands into encrypted sessions by sending cleartext commands that are processed after TLS is established. With a CVSS score of 5.1, this vulnerability has a network attack vector and high attack complexity, potentially leading to partial compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.4.6CPE matchmatch criteria
cpe:2.3:a:cmu:cyrus_imap_server:*:*:*:*:*:*:*:*
2.0.17CPE matchmatch criteria
cpe:2.3:a:cmu:cyrus_imap_server:2.0.17:*:*:*:*:*:*:*
2.1.16CPE matchmatch criteria
cpe:2.3:a:cmu:cyrus_imap_server:2.1.16:*:*:*:*:*:*:*
2.1.17CPE matchmatch criteria
cpe:2.3:a:cmu:cyrus_imap_server:2.1.17:*:*:*:*:*:*:*
2.1.18CPE matchmatch criteria
cpe:2.3:a:cmu:cyrus_imap_server:2.1.18:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.1MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
4.00%
Probability of exploitation in next 30 days
EPSS Percentile
89.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0400 is in the 86th percentile among its peer group of 19,953 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: cyrus-imapd-0:2.2.12-15.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: cyrus-imapd-0:2.3.7-7.el5_6.4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: cyrus-imapd-0:2.3.16-6.el6_1.2
View patch

Vendor Advisories (1)

redhatCVE-2011-1926Moderate

cyrus-imapd: STARTTLS plaintext command injection

Mar 25, 2011

References

bugzilla.cyrusimap.org / show_bug.cgi
Patch
bugzilla.cyrusimap.org / show_bug.cgi
Patch
git.cyrusimap.org / cyrus-imapd/patch
Patch
lists.fedoraproject.org / pipermail/package-announce/2011-June/061374.html
lists.fedoraproject.org / pipermail/package-announce/2011-June/061415.html
openwall.com / lists/oss-security/2011/05/17/15
Patch
openwall.com / lists/oss-security/2011/05/17/2
Patch
bugzilla.redhat.com / show_bug.cgi
Patch
secunia.com / advisories/44670
secunia.com / advisories/44876
secunia.com / advisories/44913
secunia.com / advisories/44928
exchange.xforce.ibmcloud.com / vulnerabilities/67867
cyrusimap.org / docs/cyrus-imapd/2.4.7/changes.php
debian.org / security/2011/dsa-2242
debian.org / security/2011/dsa-2258
kb.cert.org / vuls/id/555316
US Government Resource
mandriva.com / security/advisories
redhat.com / support/errata/RHSA-2011-0859.html
securitytracker.com / id