report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user. — CVE-2021-36386
Date
Source
MSRC
MSRC
Vendor
Microsoft
Microsoft
Threat
high
high
CVSS
7.5
7.5
Summary
Advisory CVE-2021-36386. report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument which might allow… Vendor: Microsoft. Source: MSRC. Threat: high. CVSS 7.5. See the official…
What to do
General, cautious steps (verify details in the official source):
- Prioritize patching or mitigation immediately (treat as actively risky).
- Identify affected product versions in your inventory and verify whether you are impacted.
- Apply vendor patches/updates or recommended mitigations as soon as available.
- Read the official advisory for exact affected versions and remediation steps.