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CVE-2021-43549

18
FAUCET Score

CVE-2021-43549 describes a cross-site scripting (XSS) vulnerability in OSIsoft PI Web API. A remote authenticated attacker with write access could leverage this to redirect users to malicious websites, potentially leading to sensitive information disclosure or misinformation. The vulnerability has a CVSS score of 4.8 (Medium), indicating a low complexity attack requiring high privileges and user interaction, with potential for low impact to confidentiality and integrity. There is currently no public exploit code available, it is not listed in the KEV catalog, and there is no significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

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

CVSS Data

CVSS version used by this source: 3.1

6.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
1.7
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.67%
Probability of exploitation in next 30 days
EPSS Percentile
48.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0067 is in the 85th percentile among its peer group of 4,931 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

us-cert.cisa.gov / ics/advisories/icsa-21-313-06
Third Party AdvisoryUS Government Resource