Is CVE-2019-12523 in the CISA KEV catalog?

No. CVE-2019-12523 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-12523?

CVE-2019-12523 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2019-12523?

CVE-2019-12523 has an EPSS score of 4.30% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-12523?

Upgrade squid on debian 11 to 4.9-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2019-12523

CRITICALEPSS 90th pctl

9.1

CVSS v3

NVD

Description

An issue was discovered in Squid before 4.9. When handling a URN request, a corresponding HTTP request is made. This HTTP request doesn't go through the access checks that incoming HTTP requests go through. This causes all access checks to be bypassed and allows access to restricted HTTP servers, e.g., an attacker can connect to HTTP servers that only listen on localhost.

How to fix

Remediation Available

squidDebian

Fixed in:4.9-1CVE-2019-12523

squidUbuntu

Fixed in:3.5.12-1ubuntu7.12USN-4446-1

Fixed in:3.5.27-1ubuntu1.7USN-4446-1

squid3Ubuntu

Fixed in:3.5.12-1ubuntu7.9USN-4213-1

Fixed in:3.5.12-1ubuntu7.12USN-4446-1

Fixed in:3.5.27-1ubuntu1.7USN-4446-1

Fixed in:3.5.27-1ubuntu1.4USN-4213-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

4.30%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Third-Party Advisory6

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.