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CVE-2020-12021

22
FAUCET Score

CVE-2020-12021 is a critical cross-site scripting (XSS) vulnerability affecting OSIsoft PI Web API 2019 Patch 1 and earlier versions. This flaw allows an authenticated attacker to remotely execute arbitrary code due to improper input sanitization. With a CVSS score of 9.0, it presents a high risk of complete compromise of confidentiality, integrity, and availability, though user interaction is required. While there is no public exploit code or active exploitation reported, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2019CPE matchmatch criteria
cpe:2.3:a:osisoft:pi_web_api:*:*:*:*:*:*:*:*
2019CPE matchmatch criteria
cpe:2.3:a:osisoft:pi_web_api:2019:patch_1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.0CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.3
Impact Score
6.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.57%
Probability of exploitation in next 30 days
EPSS Percentile
72.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0157 is in the 83rd percentile among its peer group of 265 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.6 Bluesky, 0.3 Mastodon, and 1.6 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

us-cert.gov / ics/advisories/icsa-20-163-01
Third Party AdvisoryUS Government Resource