fetchmail: Application hang due unguarded blocking I/O in IMAP/POP3 STARTTLS initialization (fetchmail-SA-2011-01)
Published Jun 2, 2011
5.0
MEDIUMCVSS 2.0
EPSS 2.55%
Description
fetchmail 5.9.9 through 6.3.19 does not properly limit the wait time after issuing a (1) STARTTLS or (2) STLS request, which allows remote servers to cause a denial of service (application hang) by acknowledging the request but not sending additional packets.
Affected products
No data.
- 5.9.9
- 5.9.10
- 5.9.11
- 5.9.13
- 6.0.0
- 6.1.0
- 6.1.3
- 6.2.0
- 6.2.1
- 6.2.2
- 6.2.3
- 6.2.4
- 6.2.5
- 6.2.5.1
- 6.2.5.2
- 6.2.5.4
- 6.2.6
- 6.2.6
- 6.2.6
- 6.2.9
- 6.2.9
- 6.2.9
- 6.2.9
- 6.2.9
- 6.2.9
- 6.2.9
- 6.3.0
- 6.3.1
- 6.3.2
- 6.3.3
- 6.3.4
- 6.3.5
- 6.3.6
- 6.3.6
- 6.3.6
- 6.3.6
- 6.3.6
- 6.3.6
- 6.3.7
- 6.3.8
- 6.3.9
- 6.3.9
- 6.3.10
- 6.3.11
- 6.3.12
- 6.3.13
- 6.3.14
- 6.3.15
- 6.3.16
- 6.3.17
- 6.3.18
- 6.3.19
No data.
Red Hat Enterprise Linux 4
fetchmail
Will not fix
Red Hat Enterprise Linux 5
fetchmail
Will not fix
Red Hat Enterprise Linux 6
fetchmail
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | fetchmail | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | fetchmail | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | fetchmail | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
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:L/Au:N/C:N/I:N/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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.55% (0.02551) | 84.48th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.55% (0.02551) | 82.94th | v5 (v2026.06.15) |
| Mar 30, 2025 | 2.19% (0.02192) | 82.91th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.14% (0.04139) | 80.75th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.19% (0.02192) | 83.24th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.41% (0.01411) | 87.01th | v3 (v2023.03.01) |
| May 9, 2024 | 1.41% (0.01411) | 86.39th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.41% (0.01411) | 84.39th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
References (18)
- http://gitorious.org/fetchmail/fetchmail/blobs/legacy_63/fetchmail-SA-2011-01.txt x_refsource_CONFIRM
- http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061634.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061672.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061735.html vendor-advisoryx_refsource_FEDORA
- http://openwall.com/lists/oss-security/2011/05/30/1 mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2011/05/31/12 mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2011/05/31/17 mailing-listx_refsource_MLIST
- http://openwall.com/lists/oss-security/2011/06/01/2 mailing-listx_refsource_MLIST
- http://www.fetchmail.info/fetchmail-SA-2011-01.txt x_refsource_CONFIRM
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:107 vendor-advisoryx_refsource_MANDRIVA
- http://www.securityfocus.com/archive/1/518251/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/48043 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1025605 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/security/cve/CVE-2011-1947 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=709284 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/67700 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2011-1947
- https://www.cve.org/CVERecord?id=CVE-2011-1947
Change history (0)
No recorded changes yet.