CVE-2011-1947

CVE-2011-1947 is a medium-severity vulnerability in Fetchmail with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

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.

Frequently asked questions

What is 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.
How severe is CVE-2011-1947?
CVE-2011-1947 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-1947 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-1947?
CVE-2011-1947 primarily affects Fetchmail. In total, 52 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-1947?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-1947 published?
CVE-2011-1947 was published on 2011-06-02 and last updated on 2026-06-16.

References

Affected products (52)

More vulnerabilities in Fetchmail

All CVEs affecting Fetchmail →

Other CWE-399 (Resource Management Errors) vulnerabilities

Browse all CWE-399 (Resource Management Errors) vulnerabilities →