No exploitation reportedFix available

CVE-2020-12021

No exploitation reported by the sources we read.

Published2020-06-23
WeaknessCWE-79

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 OSIsoft PI Web API 2019 Patch 1 (1.12.0.6346) and all previous versions, the affected product is vulnerable to a cross-site scripting attack, which may allow an attacker to remotely execute arbitrary code.

Timeline

dates in UTC

2020-06-2322:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2020-12021?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-12021?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Osisoft pi web api

Branch	Affected	Fixed in	Source
2019.x	≤ 2019	no fix published	NVD
2019.x	= 2019	no fix published	NVD

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.

Vendor advisories

ICSA-20-163-01 CISA1 known affected
OSIsoft PI Web API 2019
PI Web API 2019: Patch 1 (1.12.0.6346) and all previous versions

Full record on NVD

Fix

Vendor fix CISA ICSA-20-163-01 · 1 productOSIsoft recommends affected users upgrade to PI Web API 2019 SP1.= OSIsoft also recommends affected users implement the following measures to reduce exploitation:
Mitigation from the vendor CISA ICSA-20-163-01 · 1 productAvoid adding authentication type anonymous in PI Web API configuration settings to limit exposure to authenticated users only.
Mitigation from the vendor CISA ICSA-20-163-01 · 1 productConsider using a web application firewall to block HTML responses from PI Web API servers.
Mitigation from the vendor CISA ICSA-20-163-01 · 1 productLimit write access to PI Server to trusted users.
Mitigation from the vendor CISA ICSA-20-163-01 · 1 productRemove PI Web API write access to PI AF servers with the “DisableWrite” setting. For more information on the “DisableWrite” setting, please consult the PI Web API User Guide.
Mitigation from the vendor CISA ICSA-20-163-01 · 1 productEnable IE Enhanced Security Configuration on Windows servers where the Desktop Experience feature is installed.

Detection

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

Sources

NVDCVSS 3.19read 2026-10-23
NVDCVSS 2.06read 2026-10-23
CNAweakness (CWE)CWE-79read 2026-10-23
NVDweakness (CWE)CWE-79read 2026-10-23
FIRST EPSSEPSS score1.6 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Published: 2020-06-23
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-12021?

Is CVE-2020-12021 actively exploited?

Active exploitation of CVE-2020-12021 has not been confirmed. Its EPSS score was 1.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-12021?

CVE-2020-12021 has a CVSS v3 base score of 9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

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