CVE-2025-54574 · cross-distro fix matrix

CVE-2025-54574: Squid is a caching proxy for the Web. In versions 6.3 and below, Squid is vulnerable to a heap buffer overflow and possible remote code execution attack when processing URN due to incorrect buffer management. This has been fixed in version 6.4. To work around this issue, disable URN access permissio

Affects 3 Linux releases across 3 (distro × package) combinations.

Elevated exploitation risk

FIRST EPSS puts CVE-2025-54574's probability of exploitation in the next 30 days at 23% (98th percentile of all CVEs)— well above the noise floor. Prioritize it.

EPSS:23% · 30-day exploit probability98th percentile

Fix per ecosystem

Each block below is a distro release where CVE-2025-54574 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

squid→ fixed in4.13-10+deb11u5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y squid
```

Debian bookworm

Source: Debian Security Tracker

squid→ fixed in5.7-2+deb12u3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y squid
```

Debian trixie

Source: Debian Security Tracker

squid→ fixed in6.5-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y squid
```

Are YOU affected by CVE-2025-54574?

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

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