CVE-2021-43549

lowpriority · track · 19EPSS 0.007 · 53 %ileEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.71% (53rd) EPSS
CVSS 3.5 · low
Is it mine?
4 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

A remote authenticated attacker with write access to a PI Server could trick a user into interacting with a PI Web API endpoint and redirect them to a malicious website. As a result, a victim may disclose sensitive information to the attacker or be provided with false information.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

  • MitigationPI Web APIcisa_csaf_ot

    Audit the AF hierarchy to ensure there are no unauthorized databases, elements, or attributes

02

cvss

Technical severity, 0–10. One row per scoring source.

6.9
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–6.9

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9
v3.14.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 1.7 · impact 2.7
v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:Nsecondary · CISA US
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:Nsecondary · ENISA EU
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:Nsecondary · ics-cert@hq.dhs.gov USexploitability 1.7 · impact 4.7
v3.14.4mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US
04

affected products (4)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • ICSA-21-313-06OSIsoft PI Web API2021-11-09icsa · cisa_csaf_otUS

    Successful exploitation of this vulnerability could allow a remote authenticated attacker access to sensitive information or deliver false information.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdcisa_csaf_otnvdNVDCVE.orgMITRE
published 2021-11-18modified 2026-06-17
09

references (5)

External citations — patches, advisories, analysis.

scry

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