How severe is CVE-2001-0843?

CVE-2001-0843 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-0843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0843?

CVE-2001-0843 affects Squid Squid Web Proxy. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0843?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2001-0843 published?

CVE-2001-0843 was published on 2001-12-06 and last updated on 2026-06-16.

CVE-2001-0843

CVE-2001-0843 is a medium-severity vulnerability in Squid Squid Web Proxy 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.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Squid Squid Web Proxy
Published: 2001-12-06
Last modified: 2026-06-16

Description

Squid proxy server 2.4 and earlier allows remote attackers to cause a denial of service (crash) via a mkdir-only FTP PUT request.

Frequently asked questions

What is CVE-2001-0843?: Squid proxy server 2.4 and earlier allows remote attackers to cause a denial of service (crash) via a mkdir-only FTP PUT request.
How severe is CVE-2001-0843?: CVE-2001-0843 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-0843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0843?: CVE-2001-0843 affects Squid Squid Web Proxy. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0843?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-0843 published?: CVE-2001-0843 was published on 2001-12-06 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:squid:squid_web_proxy:*:*:*:*:*:*:*:*

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