Is CVE-2020-15810 in the CISA KEV catalog?

No. CVE-2020-15810 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-15810?

CVE-2020-15810 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2020-15810?

CVE-2020-15810 has an EPSS score of 2.53% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-15810?

Upgrade squid on debian 11 to 4.13-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-15810

MEDIUMEPSS 83th pctl

6.5

CVSS v3

NVD

Description

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Smuggling attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the proxy cache and any downstream caches with content from an arbitrary source. When configured for relaxed header parsing (the default), Squid relays headers containing whitespace characters to upstream servers. When this occurs as a prefix to a Content-Length header, the frame length specified will be ignored by Squid (allowing for a conflicting length to be used from another Content-Length header) but relayed upstream.

CWE-444

How to fix

Remediation Available

squidDebian

Fixed in:4.13-1CVE-2020-15810

squidUbuntu

Fixed in:3.5.12-1ubuntu7.15USN-4551-1

Fixed in:3.5.27-1ubuntu1.9USN-4551-1

Fixed in:4.10-1ubuntu1.2USN-4477-1

squid3Ubuntu

Fixed in:3.5.12-1ubuntu7.15USN-4551-1

Fixed in:3.5.27-1ubuntu1.9USN-4551-1

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.53%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Mitigation1

github.com

Third-Party Advisory8

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.