Read the docs
TI-2011-01698 Aliases CVE-2011-1926GHSA-w7v6-vm58-fw22

The STARTTLS implementation in Cyrus IMAP Server before 2.4.7 does not properly restrict…

Priority LOW 30CWE-264Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
Partial · Partial · Partial
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-264.

Summary

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.

Why it matters now

EPSS 0.03999 90th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 35

CPEVersionsRoleVendor
cpe:2.3:a:cmu:cyrus_imap_server:*:*:*:*:*:*:*:*up to 2.4.6VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.0.17:*:*:*:*:*:*:*2.0.17VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.1.16:*:*:*:*:*:*:*2.1.16VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.1.17:*:*:*:*:*:*:*2.1.17VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.1.18:*:*:*:*:*:*:*2.1.18VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.2.8:*:*:*:*:*:*:*2.2.8VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.2.9:*:*:*:*:*:*:*2.2.9VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.2.10:*:*:*:*:*:*:*2.2.10VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.2.11:*:*:*:*:*:*:*2.2.11VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.2.12:*:*:*:*:*:*:*2.2.12VulnerablePanda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:*:*:*:*:*:*:*:* Versions up to 2.4.6 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.0.17:*:*:*:*:*:*:* Versions 2.0.17 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.1.16:*:*:*:*:*:*:* Versions 2.1.16 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.1.17:*:*:*:*:*:*:* Versions 2.1.17 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.1.18:*:*:*:*:*:*:* Versions 2.1.18 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.8:*:*:*:*:*:*:* Versions 2.2.8 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.9:*:*:*:*:*:*:* Versions 2.2.9 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.10:*:*:*:*:*:*:* Versions 2.2.10 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.11:*:*:*:*:*:*:* Versions 2.2.11 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.12:*:*:*:*:*:*:* Versions 2.2.12 Vulnerable ·Panda3D
Show 25 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:cmu:cyrus_imap_server:2.2.13:*:*:*:*:*:*:*2.2.13VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.2.13p1:*:*:*:*:*:*:*2.2.13p1VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.0:*:*:*:*:*:*:*2.3.0VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.1:*:*:*:*:*:*:*2.3.1VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.2:*:*:*:*:*:*:*2.3.2VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.3:*:*:*:*:*:*:*2.3.3VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.4:*:*:*:*:*:*:*2.3.4VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.5:*:*:*:*:*:*:*2.3.5VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.6:*:*:*:*:*:*:*2.3.6VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.7:*:*:*:*:*:*:*2.3.7VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.8:*:*:*:*:*:*:*2.3.8VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.9:*:*:*:*:*:*:*2.3.9VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.10:*:*:*:*:*:*:*2.3.10VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.11:*:*:*:*:*:*:*2.3.11VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.12:*:*:*:*:*:*:*2.3.12VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.13:*:*:*:*:*:*:*2.3.13VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.14:*:*:*:*:*:*:*2.3.14VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.15:*:*:*:*:*:*:*2.3.15VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.3.16:*:*:*:*:*:*:*2.3.16VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.4.0:*:*:*:*:*:*:*2.4.0VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.4.1:*:*:*:*:*:*:*2.4.1VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.4.2:*:*:*:*:*:*:*2.4.2VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.4.3:*:*:*:*:*:*:*2.4.3VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.4.4:*:*:*:*:*:*:*2.4.4VulnerablePanda3D
cpe:2.3:a:cmu:cyrus_imap_server:2.4.5:*:*:*:*:*:*:*2.4.5VulnerablePanda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.13:*:*:*:*:*:*:* Versions 2.2.13 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.2.13p1:*:*:*:*:*:*:* Versions 2.2.13p1 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.0:*:*:*:*:*:*:* Versions 2.3.0 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.1:*:*:*:*:*:*:* Versions 2.3.1 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.2:*:*:*:*:*:*:* Versions 2.3.2 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.3:*:*:*:*:*:*:* Versions 2.3.3 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.4:*:*:*:*:*:*:* Versions 2.3.4 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.5:*:*:*:*:*:*:* Versions 2.3.5 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.6:*:*:*:*:*:*:* Versions 2.3.6 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.7:*:*:*:*:*:*:* Versions 2.3.7 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.8:*:*:*:*:*:*:* Versions 2.3.8 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.9:*:*:*:*:*:*:* Versions 2.3.9 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.10:*:*:*:*:*:*:* Versions 2.3.10 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.11:*:*:*:*:*:*:* Versions 2.3.11 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.12:*:*:*:*:*:*:* Versions 2.3.12 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.13:*:*:*:*:*:*:* Versions 2.3.13 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.14:*:*:*:*:*:*:* Versions 2.3.14 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.15:*:*:*:*:*:*:* Versions 2.3.15 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.3.16:*:*:*:*:*:*:* Versions 2.3.16 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.4.0:*:*:*:*:*:*:* Versions 2.4.0 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.4.1:*:*:*:*:*:*:* Versions 2.4.1 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.4.2:*:*:*:*:*:*:* Versions 2.4.2 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.4.3:*:*:*:*:*:*:* Versions 2.4.3 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.4.4:*:*:*:*:*:*:* Versions 2.4.4 Vulnerable ·Panda3D
  • cpe:2.3:a:cmu:cyrus_imap_server:2.4.5:*:*:*:*:*:*:* Versions 2.4.5 Vulnerable ·Panda3D

Remediation

Red Hat 1 advisory

  • RHSA-2011:0859 Released 2011-06-08 · Red Hat rating Moderate
    cyrus-imapd security update
    • Red Hat Enterprise Linux (v. 5.6.z server) cyrus-imapd-2.3.7-7.el5_6.4, cyrus-imapd-2.3.7-7.el5_6.4.i386, cyrus-imapd-2.3.7-7.el5_6.4.ia64 +13
    • Red Hat Enterprise Linux AS version 4 cyrus-imapd-2.2.12-15.el4, cyrus-imapd-2.2.12-15.el4.i386, cyrus-imapd-2.2.12-15.el4.ia64 +21
    • Red Hat Enterprise Linux Desktop version 4 cyrus-imapd-2.2.12-15.el4, cyrus-imapd-2.2.12-15.el4.i386, cyrus-imapd-devel-2.2.12-15.el4 +9
    • Red Hat Enterprise Linux ES version 4 cyrus-imapd-2.2.12-15.el4, cyrus-imapd-2.2.12-15.el4.i386, cyrus-imapd-2.2.12-15.el4.ia64 +15
    • Red Hat Enterprise Linux Server (v. 6) cyrus-imapd-2.3.16-6.el6_1.2, cyrus-imapd-utils-2.3.16-6.el6_1.2
    • Red Hat Enterprise Linux Server Optional (v. 6) cyrus-imapd-2.3.16-6.el6_1.2, cyrus-imapd-devel-2.3.16-6.el6_1.2, cyrus-imapd-devel-2.3.16-6.el6_1.2.ppc
    • Red Hat Enterprise Linux WS version 4 cyrus-imapd-2.2.12-15.el4, cyrus-imapd-2.2.12-15.el4.i386, cyrus-imapd-2.2.12-15.el4.ia64 +15

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux (v. 5.6.z server)Fixed RHSA-2011:0859
Red Hat Enterprise Linux AS version 4Fixed RHSA-2011:0859
Red Hat Enterprise Linux Desktop version 4Fixed RHSA-2011:0859
Red Hat Enterprise Linux ES version 4Fixed RHSA-2011:0859
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2011:0859
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2011:0859
Red Hat Enterprise Linux WS version 4Fixed RHSA-2011:0859

Timeline

  1. 2026-10-02 Threatist record created from CVE-2011-1926
  2. 2026-10-03 Alias added: GHSA-w7v6-vm58-fw22

References

Patch 6

Advisory 7

Other 1

  • TI-2011-02838 Stack-based buffer overflow in the split_wildmats function in nntpd.c in nntpd in Cyrus… CVSS 2.0HIGH 7.5
  • TI-2011-03062 The index_get_ids function in index.c in imapd in Cyrus IMAP Server before 2.4.11, when… CVSS 2.0MEDIUM 4.3
  • TI-2009-02515 Buffer overflow in the SIEVE script component (sieve/script.c), as used in cyrus-imapd in… CVSS 2.0MEDIUM 4.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences