CVE-2011-1947

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.

Published: 2011-06-02 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1947 is rated Moderate Risk (49.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.55%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-1947

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.44% 2.55% +0.11%
2 2025-07-13 2.19% 2.44% +0.25%
3 2025-03-30 — 2.19% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1947

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-1947

OS Trackers for CVE-2011-1947

vendor priority summary link
debian unimportant CVE-2011-1947 unimportant priority: Debian including 1 source packages (fetchmail), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-1947
redhat low — https://access.redhat.com/security/cve/CVE-2011-1947
suse medium CVE-2011-1947 severity moderate: SUSE including 13 source package names (fetchmail-6.3.26-12.3, fetchmail-6.3.26-13.4, …), 40 product×package rows across 26 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (26 product lines)): Fixed 40. https://www.suse.com/security/cve/CVE-2011-1947/
ubuntu low CVE-2011-1947 low priority: Ubuntu including 1 source packages (fetchmail), 27 status rows across 27 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hardy, hirsute, impish, jammy, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): ignored 19, not-affected 6, DNE 1, pending 1. https://ubuntu.com/security/CVE-2011-1947

Affected software / configurations for CVE-2011-1947

Vendor Product Version Raw CPE
fetchmail fetchmail 5.9.9 cpe:2.3:a:fetchmail:fetchmail:5.9.9:*:*:*:*:*:*:*
fetchmail fetchmail 5.9.10 cpe:2.3:a:fetchmail:fetchmail:5.9.10:*:*:*:*:*:*:*
fetchmail fetchmail 5.9.11 cpe:2.3:a:fetchmail:fetchmail:5.9.11:*:*:*:*:*:*:*
fetchmail fetchmail 5.9.13 cpe:2.3:a:fetchmail:fetchmail:5.9.13:*:*:*:*:*:*:*
fetchmail fetchmail 6.0.0 cpe:2.3:a:fetchmail:fetchmail:6.0.0:*:*:*:*:*:*:*
fetchmail fetchmail 6.1.0 cpe:2.3:a:fetchmail:fetchmail:6.1.0:*:*:*:*:*:*:*
fetchmail fetchmail 6.1.3 cpe:2.3:a:fetchmail:fetchmail:6.1.3:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.0 cpe:2.3:a:fetchmail:fetchmail:6.2.0:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.1 cpe:2.3:a:fetchmail:fetchmail:6.2.1:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.2 cpe:2.3:a:fetchmail:fetchmail:6.2.2:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.3 cpe:2.3:a:fetchmail:fetchmail:6.2.3:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.4 cpe:2.3:a:fetchmail:fetchmail:6.2.4:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.5 cpe:2.3:a:fetchmail:fetchmail:6.2.5:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.5.1 cpe:2.3:a:fetchmail:fetchmail:6.2.5.1:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.5.2 cpe:2.3:a:fetchmail:fetchmail:6.2.5.2:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.5.4 cpe:2.3:a:fetchmail:fetchmail:6.2.5.4:*:*:*:*:*:*:*
fetchmail fetchmail 6.2.6 cpe:2.3:a:fetchmail:fetchmail:6.2.6:pre4:*:*:*:*:*:*
fetchmail fetchmail 6.2.6 cpe:2.3:a:fetchmail:fetchmail:6.2.6:pre8:*:*:*:*:*:*
fetchmail fetchmail 6.2.6 cpe:2.3:a:fetchmail:fetchmail:6.2.6:pre9:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc10:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc3:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc4:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc5:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc7:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc8:*:*:*:*:*:*
fetchmail fetchmail 6.2.9 cpe:2.3:a:fetchmail:fetchmail:6.2.9:rc9:*:*:*:*:*:*
fetchmail fetchmail 6.3.0 cpe:2.3:a:fetchmail:fetchmail:6.3.0:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.1 cpe:2.3:a:fetchmail:fetchmail:6.3.1:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.2 cpe:2.3:a:fetchmail:fetchmail:6.3.2:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.3 cpe:2.3:a:fetchmail:fetchmail:6.3.3:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.4 cpe:2.3:a:fetchmail:fetchmail:6.3.4:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.5 cpe:2.3:a:fetchmail:fetchmail:6.3.5:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.6 cpe:2.3:a:fetchmail:fetchmail:6.3.6:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.6 cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc1:*:*:*:*:*:*
fetchmail fetchmail 6.3.6 cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc2:*:*:*:*:*:*
fetchmail fetchmail 6.3.6 cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc3:*:*:*:*:*:*
fetchmail fetchmail 6.3.6 cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc4:*:*:*:*:*:*
fetchmail fetchmail 6.3.6 cpe:2.3:a:fetchmail:fetchmail:6.3.6:rc5:*:*:*:*:*:*
fetchmail fetchmail 6.3.7 cpe:2.3:a:fetchmail:fetchmail:6.3.7:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.8 cpe:2.3:a:fetchmail:fetchmail:6.3.8:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.9 cpe:2.3:a:fetchmail:fetchmail:6.3.9:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.9 cpe:2.3:a:fetchmail:fetchmail:6.3.9:rc2:*:*:*:*:*:*
fetchmail fetchmail 6.3.10 cpe:2.3:a:fetchmail:fetchmail:6.3.10:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.11 cpe:2.3:a:fetchmail:fetchmail:6.3.11:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.12 cpe:2.3:a:fetchmail:fetchmail:6.3.12:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.13 cpe:2.3:a:fetchmail:fetchmail:6.3.13:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.14 cpe:2.3:a:fetchmail:fetchmail:6.3.14:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.15 cpe:2.3:a:fetchmail:fetchmail:6.3.15:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.16 cpe:2.3:a:fetchmail:fetchmail:6.3.16:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.17 cpe:2.3:a:fetchmail:fetchmail:6.3.17:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.18 cpe:2.3:a:fetchmail:fetchmail:6.3.18:*:*:*:*:*:*:*
fetchmail fetchmail 6.3.19 cpe:2.3:a:fetchmail:fetchmail:6.3.19:*:*:*:*:*:*:*

References for CVE-2011-1947

URL Tags
http://gitorious.org/fetchmail/fetchmail/blobs/legacy_63/fetchmail-SA-2011-01.txt
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061634.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061672.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061735.html
http://openwall.com/lists/oss-security/2011/05/30/1
http://openwall.com/lists/oss-security/2011/05/31/12
http://openwall.com/lists/oss-security/2011/05/31/17
http://openwall.com/lists/oss-security/2011/06/01/2
http://www.fetchmail.info/fetchmail-SA-2011-01.txt
http://www.mandriva.com/security/advisories?name=MDVSA-2011:107
http://www.securityfocus.com/archive/1/518251/100/0/threaded
http://www.securityfocus.com/bid/48043
http://www.securitytracker.com/id?1025605
https://exchange.xforce.ibmcloud.com/vulnerabilities/67700
cvelogic Threat Intelligence