Is CVE-2019-18677 in the CISA KEV catalog?

No. CVE-2019-18677 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2019-18677?

CVE-2019-18677 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2019-18677?

CVE-2019-18677 has an EPSS score of 7.24% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-18677?

Upgrade squid on debian 11 to 4.9-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2019-18677

MEDIUMEPSS 94th pctl

6.1

CVSS v3

NVD

Description

An issue was discovered in Squid 3.x and 4.x through 4.8 when the append_domain setting is used (because the appended characters do not properly interact with hostname length restrictions). Due to incorrect message processing, it can inappropriately redirect traffic to origins it should not be delivered to.

CWE-352Cross-Site Request Forgery

How to fix

Remediation Available

squidDebian

Fixed in:4.9-1CVE-2019-18677

squid3Ubuntu

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

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 InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

7.24%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory4

Release Notes2

Other references4

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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.