postfix: SMTP commands injection during plaintext to TLS session switch
Published Mar 16, 2011
6.8
MEDIUMCVSS 2.0
EPSS 16.33%
Description
The STARTTLS implementation in Postfix 2.4.x before 2.4.16, 2.5.x before 2.5.12, 2.6.x before 2.6.9, and 2.7.x before 2.7.3 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack.
Affected products
No data.
Configuration 1
- 2.4
- 2.4.0
- 2.4.1
- 2.4.2
- 2.4.3
- 2.4.4
- 2.4.5
- 2.4.6
- 2.4.7
- 2.4.8
- 2.4.9
- 2.4.10
- 2.4.11
- 2.4.12
- 2.4.13
- 2.4.14
- 2.4.15
Configuration 2
- 2.5.0
- 2.5.1
- 2.5.2
- 2.5.3
- 2.5.4
- 2.5.5
- 2.5.6
- 2.5.7
- 2.5.8
- 2.5.9
- 2.5.10
- 2.5.11
Configuration 3
- 2.6
- 2.6.0
- 2.6.1
- 2.6.2
- 2.6.3
- 2.6.4
- 2.6.5
- 2.6.6
- 2.6.7
- 2.6.8
No data.
Red Hat Enterprise Linux 4
postfix-2:2.2.10-1.4.el4
Fixed · RHSA-2011:0422
Red Hat Enterprise Linux 5
postfix-2:2.3.3-2.2.el5_6
Fixed · RHSA-2011:0422
Red Hat Enterprise Linux 6
postfix-2:2.6.6-2.1.el6_0
Fixed · RHSA-2011:0423
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | postfix-2:2.2.10-1.4.el4 | Fixed | RHSA-2011:0422 |
| Red Hat Enterprise Linux 5 | postfix-2:2.3.3-2.2.el5_6 | Fixed | RHSA-2011:0422 |
| Red Hat Enterprise Linux 6 | postfix-2:2.6.6-2.1.el6_0 | Fixed | RHSA-2011:0423 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affected postfix packages in Red Hat Enterprise Linux 4, 5, and 6. It was corrected via RHSA-2011:0422 and RHSA-2011:0423. This issue did not affect the versions of sendmail as shipped with Red Hat Enterprise Linux 3, 4, 5, or 6, and the versions of exim as shipped with Red Hat Enterprise Linux 4 and 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (42 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 16.33% (0.16334) | 96.87th | v5 (v2026.06.15) |
| Jun 15, 2026 | 16.33% (0.16334) | 96.54th | v5 (v2026.06.15) |
| Jun 13, 2026 | 37.77% (0.37771) | 97.31th | v4 (v2025.03.14) |
| May 30, 2026 | 32.22% (0.32222) | 96.92th | v4 (v2025.03.14) |
| Apr 21, 2026 | 42.70% (0.42698) | 97.48th | v4 (v2025.03.14) |
| Mar 4, 2026 | 72.43% (0.72431) | 98.73th | v4 (v2025.03.14) |
| Mar 1, 2026 | 36.60% (0.36598) | 97.07th | v4 (v2025.03.14) |
| Feb 4, 2026 | 72.43% (0.72431) | 98.72th | v4 (v2025.03.14) |
| Feb 1, 2026 | 36.60% (0.36598) | 97.04th | v4 (v2025.03.14) |
| Jan 20, 2026 | 72.43% (0.72431) | 98.72th | v4 (v2025.03.14) |
| Jan 18, 2026 | 61.93% (0.61931) | 98.27th | v4 (v2025.03.14) |
| Jan 4, 2026 | 72.06% (0.72060) | 98.69th | v4 (v2025.03.14) |
| Jan 1, 2026 | 29.59% (0.29589) | 96.49th | v4 (v2025.03.14) |
| Dec 13, 2025 | 72.06% (0.72060) | 98.69th | v4 (v2025.03.14) |
| Dec 4, 2025 | 69.45% (0.69450) | 98.58th | v4 (v2025.03.14) |
| Dec 1, 2025 | 34.74% (0.34744) | 96.86th | v4 (v2025.03.14) |
| Nov 4, 2025 | 69.45% (0.69450) | 98.58th | v4 (v2025.03.14) |
| Nov 1, 2025 | 34.74% (0.34744) | 96.84th | v4 (v2025.03.14) |
| Oct 10, 2025 | 69.45% (0.69450) | 98.58th | v4 (v2025.03.14) |
| Oct 4, 2025 | 72.47% (0.72471) | 98.71th | v4 (v2025.03.14) |
| Oct 1, 2025 | 38.97% (0.38967) | 97.18th | v4 (v2025.03.14) |
| Sep 4, 2025 | 69.45% (0.69450) | 98.60th | v4 (v2025.03.14) |
| Sep 1, 2025 | 34.74% (0.34744) | 96.91th | v4 (v2025.03.14) |
| Aug 4, 2025 | 69.45% (0.69450) | 98.58th | v4 (v2025.03.14) |
| Aug 1, 2025 | 34.74% (0.34744) | 96.88th | v4 (v2025.03.14) |
| Jul 4, 2025 | 69.45% (0.69450) | 98.55th | v4 (v2025.03.14) |
| Jul 1, 2025 | 34.74% (0.34744) | 96.84th | v4 (v2025.03.14) |
| Jun 4, 2025 | 69.45% (0.69450) | 98.54th | v4 (v2025.03.14) |
| Jun 1, 2025 | 34.74% (0.34744) | 96.82th | v4 (v2025.03.14) |
| May 10, 2025 | 69.45% (0.69450) | 98.54th | v4 (v2025.03.14) |
| May 4, 2025 | 61.28% (0.61283) | 98.19th | v4 (v2025.03.14) |
| May 1, 2025 | 26.15% (0.26151) | 95.99th | v4 (v2025.03.14) |
| Apr 2, 2025 | 61.28% (0.61283) | 98.17th | v4 (v2025.03.14) |
| Mar 30, 2025 | 55.98% (0.55978) | 97.89th | v4 (v2025.03.14) |
| Mar 29, 2025 | 66.01% (0.66011) | 97.94th | v4 (v2025.03.14) |
| Mar 17, 2025 | 55.98% (0.55978) | 97.87th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.14% (0.01138) | 85.37th | v3 (v2023.03.01) |
| Apr 11, 2024 | 1.14% (0.01138) | 84.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.14% (0.01138) | 82.50th | v3 (v2023.03.01) |
| Mar 6, 2023 | 6.09% (0.06088) | 90.58th | v2 (v2022.01.01) |
| Apr 1, 2022 | 6.09% (0.06088) | 89.70th | v2 (v2022.01.01) |
| Feb 4, 2022 | 6.09% (0.06088) | 77.55th | v2 (v2022.01.01) |
References (28)
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705 x_refsource_CONFIRM
- http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html vendor-advisoryx_refsource_APPLE
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056559.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2011-March/056560.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-security-announce/2011-05/msg00005.html vendor-advisoryx_refsource_SUSE
- http://secunia.com/advisories/43646 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/43874 third-party-advisoryx_refsource_SECUNIA
- http://security.gentoo.org/glsa/glsa-201206-33.xml vendor-advisoryx_refsource_GENTOO
- http://securitytracker.com/id?1025179 vdb-entryx_refsource_SECTRACK
- http://support.apple.com/kb/HT5002 x_refsource_CONFIRM
- http://www.debian.org/security/2011/dsa-2233 vendor-advisoryx_refsource_DEBIAN
- http://www.kb.cert.org/vuls/id/555316 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.kb.cert.org/vuls/id/MORO-8ELH6Z x_refsource_CONFIRMUS Government Resource
- http://www.openwall.com/lists/oss-security/2021/08/10/2 mailing-listx_refsource_MLIST
- http://www.oracle.com/technetwork/topics/security/cpuapr2011-301950.html x_refsource_CONFIRM
- http://www.osvdb.org/71021 vdb-entryx_refsource_OSVDB
- http://www.postfix.org/CVE-2011-0411.html x_refsource_CONFIRMExploitVendor Advisory
- http://www.redhat.com/support/errata/RHSA-2011-0422.html vendor-advisoryx_refsource_REDHAT
- http://www.redhat.com/support/errata/RHSA-2011-0423.html vendor-advisoryx_refsource_REDHAT
- http://www.securityfocus.com/bid/46767 vdb-entryx_refsource_BID
- http://www.vupen.com/english/advisories/2011/0611 vdb-entryx_refsource_VUPENVendor Advisory
- http://www.vupen.com/english/advisories/2011/0752 vdb-entryx_refsource_VUPEN
- http://www.vupen.com/english/advisories/2011/0891 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2011-0411 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=674814 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65932 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2011-0411
- https://www.cve.org/CVERecord?id=CVE-2011-0411
Change history (0)
No recorded changes yet.