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CVE-2011-3481

17
FAUCET Score

CVE-2011-3481 describes a denial-of-service vulnerability in Cyrus IMAP Server versions prior to 2.4.11, specifically within the imapd's index_get_ids function when server-side threading is enabled. A remote attacker can trigger a NULL pointer dereference and daemon crash by sending a specially crafted email with a malicious References header. This vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and partial availability impact, but no confidentiality or integrity impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.4.10CPE 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

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.14%
Probability of exploitation in next 30 days
EPSS Percentile
80.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0214 is in the 67th percentile among its peer group of 19,958 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 (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: cyrus-imapd-0:2.2.12-17.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: cyrus-imapd-0:2.3.7-12.el5_7.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: cyrus-imapd-0:2.3.16-6.el6_1.4
View patch

Vendor Advisories (1)

redhatCVE-2011-3481Moderate

cyrus-imapd: NULL pointer dereference via crafted References header in email

Dec 17, 2005

References

bugzilla.cyrusimap.org / show_bug.cgi
bugzilla.cyrusimap.org / show_bug.cgi
git.cyrusimap.org / cyrus-imapd/commit
Patch
exchange.xforce.ibmcloud.com / vulnerabilities/69842
mandriva.com / security/advisories
redhat.com / support/errata/RHSA-2011-1508.html