Public proof of conceptFix available

CVE-2020-1947

Q: Is CVE-2020-1947 actively exploited?

Active exploitation of CVE-2020-1947 has not been confirmed. Its EPSS score was 33.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-1947?

CVE-2020-1947 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2020-03-11
WeaknessCWE-502

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

In Apache ShardingSphere(incubator) 4.0.0-RC3 and 4.0.0, the ShardingSphere's web console uses the SnakeYAML library for parsing YAML inputs to load datasource configuration. SnakeYAML allows to unmarshal data to a Java type By using the YAML tag. Unmarshalling untrusted data can lead to security flaws of RCE.

Timeline

dates in UTC

2020-03-1121:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

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-2020-1947?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-1947?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Apache shardingsphere

Branch	Affected	Fixed in	Source
4.0	= 4.0.0	no fix published	NVD

shardingsphere

Branch	Affected	Fixed in	Source
4.0	≥ 4.0.0-RC3, < 4.0.1	4.0.1	OSV

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

Fix

Advisories and patches

lists.apache.orgVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 4 repositories, unverifiedjas502n/CVE-2020-1947wsfengfan/CVE-2020-1947shadowsock5/ShardingSphere_CVE-2020-1947StarkChristmas/CVE-2020-1947

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-502read 2026-10-23
FIRST EPSSEPSS score33.9 %read 2026-10-23
PoC-in-GitHubproof of concept4read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2020-03-11
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-1947?

Is CVE-2020-1947 actively exploited?

Active exploitation of CVE-2020-1947 has not been confirmed. Its EPSS score was 33.9% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-1947?

CVE-2020-1947 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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