CVE-2025-545749.3CriticalCWE-122

CVE-2025-54574: Squid's URN Handling can lead to Buffer Overflow

squid-cache · squid

Affected: squid-cache · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

22.1%probability of exploitation in the next 30 days

97th percentile

050100

Higher than 97% of scored CVEs

9.3CriticalCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 permissions.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

squid-cache · squid< 6.4

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Heap-based Buffer Overflow · Memory Corruption
Vendor: squid-cache
Published: August 2025
Band: Likely to be exploited (10% or more), August 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-54574 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.