Is CVE-2020-13956 in the CISA KEV catalog?

No. CVE-2020-13956 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-13956?

CVE-2020-13956 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2020-13956?

CVE-2020-13956 has an EPSS score of 8.67% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-13956?

Upgrade httpcomponents-client on debian 11 to 4.5.13-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-13956

MEDIUMEPSS 94th pctl

5.3

CVSS v3

NVD

Description

Apache HttpClient versions prior to version 4.5.13 and 5.0.3 can misinterpret malformed authority component in request URIs passed to the library as java.net.URI object and pick the wrong target host for request execution.

How to fix

Remediation Available

httpcomponents-clientDebian

Fixed in:4.5.13-1CVE-2020-13956

httpcomponents-clientUbuntu

Fixed in:4.3.3-1ubuntu0.1+esm2USN-5239-1

Fixed in:4.5.1-1ubuntu0.1~esm1USN-5239-1

Fixed in:4.5.5-1ubuntu0.1~esm1USN-5239-1

Fixed in:4.5.11-1ubuntu0.1~esm1USN-5239-1

libhttpclient-javaUbuntu

Fixed in:4.3.3-1ubuntu0.1+esm2USN-5239-1

Fixed in:4.5.1-1ubuntu0.1~esm1USN-5239-1

Fixed in:4.5.5-1ubuntu0.1~esm1USN-5239-1

Fixed in:4.5.11-1ubuntu0.1~esm1USN-5239-1

SQL DeveloperWindows application

Affected:20.4.1.407.0006Fixed in:20.4.1.407.0006Oracle Corporation

Affected:21.99Fixed in:21.99Oracle Corporation

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

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

8.67%probability of exploitation in 30 days

94thpercentile

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

References

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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 2025-12-01.