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CVE-2011-1947

21
FAUCET Score

CVE-2011-1947 describes a denial-of-service vulnerability in Fetchmail versions 5.9.9 through 6.3.19. Remote servers can exploit this by acknowledging STARTTLS or STLS requests but then withholding further data, causing the Fetchmail application to hang indefinitely. This vulnerability has a CVSS score of 5.0, indicating a medium severity, and can be exploited remotely with low attack complexity, leading to a partial availability impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
5.9.9CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:5.9.9:*:*:*:*:*:*:*
5.9.10CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:5.9.10:*:*:*:*:*:*:*
5.9.11CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:5.9.11:*:*:*:*:*:*:*
5.9.13CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:5.9.13:*:*:*:*:*:*:*
6.0.0CPE matchmatch criteria
cpe:2.3:a:fetchmail:fetchmail:6.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.55%
Probability of exploitation in next 30 days
EPSS Percentile
83.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0255 is in the 75th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: fetchmail
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: fetchmail
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: fetchmail

Vendor Advisories (1)

redhatCVE-2011-1947Low

fetchmail: Application hang due unguarded blocking I/O in IMAP/POP3 STARTTLS initialization (fetchmail-SA-2011-01)

May 30, 2011

References

gitorious.org / fetchmail/fetchmail/blobs/legacy_63/fetchmail-SA-2011-01.txt
lists.fedoraproject.org / pipermail/package-announce/2011-June/061634.html
lists.fedoraproject.org / pipermail/package-announce/2011-June/061672.html
lists.fedoraproject.org / pipermail/package-announce/2011-June/061735.html
openwall.com / lists/oss-security/2011/05/30/1
openwall.com / lists/oss-security/2011/05/31/12
openwall.com / lists/oss-security/2011/05/31/17
openwall.com / lists/oss-security/2011/06/01/2
exchange.xforce.ibmcloud.com / vulnerabilities/67700
fetchmail.info / fetchmail-SA-2011-01.txt
mandriva.com / security/advisories
securityfocus.com / archive/1/518251/100/0/threaded
securityfocus.com / bid/48043
securitytracker.com / id