No exploitation reportedFix available

CVE-2020-13956

Q: Is CVE-2020-13956 actively exploited?

Active exploitation of CVE-2020-13956 has not been confirmed. Its EPSS score was 9.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-13956?

CVE-2020-13956 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

No exploitation reported by the sources we read.

Published2020-12-02
WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2020-12-0217:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-13956?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-13956?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Oracle primavera unifier

Branch	Affected	Fixed in	Source
17.x	≥ 17.7, ≤ 17.12	no fix published	NVD
16.1	= 16.1	no fix published	NVD
16.2	= 16.2	no fix published	NVD
18.8	= 18.8	no fix published	NVD
19.12	= 19.12	no fix published	NVD
20.12	= 20.12	no fix published	NVD

Oracle peoplesoft enterprise pt peopletools

Branch	Affected	Fixed in	Source
8.57	= 8.57	no fix published	NVD
8.58	= 8.58	no fix published	NVD
8.59	= 8.59	no fix published	NVD

Apache httpclient

Branch	Affected	Fixed in	Source
5.0	≥ 5.0.0, < 5.0.3	5.0.3	NVD · OSV
4.5	< 4.5.13	4.5.13	NVD · OSV

14 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

aopallianceAlmaLinux:8all versions · fixed in 1.0-17.module_el8.6.0+2752+f1f3449e
aopallianceAlmaLinux:8all versions · fixed in 1.0-20.module_el8.6.0+2786+d7c38b21
apache-commons-cliAlmaLinux:8all versions · fixed in 1.4-4.module_el8.6.0+2752+f1f3449e
apache-commons-cliAlmaLinux:8all versions · fixed in 1.4-7.module_el8.6.0+2786+d7c38b21
apache-commons-codecAlmaLinux:8all versions · fixed in 1.11-3.module_el8.6.0+2752+f1f3449e
apache-commons-codecAlmaLinux:8all versions · fixed in 1.13-3.module_el8.6.0+2786+d7c38b21
apache-commons-ioAlmaLinux:8all versions · fixed in 1:2.6-3.module_el8.6.0+2752+f1f3449e
apache-commons-ioAlmaLinux:8all versions · fixed in 1:2.6-6.module_el8.6.0+2786+d7c38b21

53 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-10-08
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.15.32026-10-08
NVDCVSS 3.15.3read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CISA-ADPweakness (CWE)CWE-202026-10-08
FIRST EPSSEPSS score9.0 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Published: 2020-12-02
Last Modified: 2026-10-08
NVD status: Modified

Frequently asked questions

What is CVE-2020-13956?

Is CVE-2020-13956 actively exploited?

Active exploitation of CVE-2020-13956 has not been confirmed. Its EPSS score was 9.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

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

CVE-2020-13956 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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