StackPatch is liveSee product

Back to CVE digest
CVE-2021-36386 · cross-distro fix matrix

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 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 re

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-36386 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • fetchmail→ fixed in6.4.16-4urgency: unimportant
    sudo apt-get install --only-upgrade -y fetchmail

Debian bookworm

Source: Debian Security Tracker

  • fetchmail→ fixed in6.4.16-4urgency: unimportant
    sudo apt-get install --only-upgrade -y fetchmail

Debian trixie

Source: Debian Security Tracker

  • fetchmail→ fixed in6.4.16-4urgency: unimportant
    sudo apt-get install --only-upgrade -y fetchmail

Alpine v3.20

Source: Alpine secdb

  • fetchmail→ fixed in6.4.20-r0
    apk update && apk add --upgrade fetchmail

Alpine v3.21

Source: Alpine secdb

  • fetchmail→ fixed in6.4.20-r0
    apk update && apk add --upgrade fetchmail

Alpine edge

Source: Alpine secdb

  • fetchmail→ fixed in6.4.20-r0
    apk update && apk add --upgrade fetchmail

Alpine v3.18

Source: Alpine secdb

  • fetchmail→ fixed in6.4.20-r0
    apk update && apk add --upgrade fetchmail

Alpine v3.19

Source: Alpine secdb

  • fetchmail→ fixed in6.4.20-r0
    apk update && apk add --upgrade fetchmail
Are YOU affected by CVE-2021-36386?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash
Form-based quickscan View on NVD
Continuous monitoring beats manual checking

CVE-2021-36386dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

See StackPatch ($99 lifetime)