How severe is CVE-2021-43549?

CVE-2021-43549 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2021-43549 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43549?

CVE-2021-43549 affects Osisoft Pi Web Api. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43549?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-43549 published?

CVE-2021-43549 was published on 2021-11-18 and last updated on 2026-06-17.

CVE-2021-43549

CVE-2021-43549 is a medium-severity vulnerability in Osisoft Pi Web Api with a CVSS 3.x base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.9)
CVSS v2: 3.5
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Osisoft Pi Web Api
Published: 2021-11-18
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-43549?: 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.
How severe is CVE-2021-43549?: CVE-2021-43549 has a CVSS 3.x base score of 6.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2021-43549 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43549?: CVE-2021-43549 affects Osisoft Pi Web Api. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43549?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43549 published?: CVE-2021-43549 was published on 2021-11-18 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-313-06

Affected products (1)

cpe:2.3:a:osisoft:pi_web_api:*:*:*:*:*:*:*:*

More vulnerabilities in Osisoft Pi Web Api

CVE-2018-7500 — Critical (CVSS 9.8): A Permissions, Privileges, and Access Controls issue was discovered in OSIsoft PI Web API versions 2017 R2 and prior.…
CVE-2020-12021 — Critical (CVSS 9.0): In OSIsoft PI Web API 2019 Patch 1 (1.12.0.6346) and all previous versions, the affected product is vulnerable to a…
CVE-2019-13516 — High (CVSS 8.8): In OSIsoft PI Web API and prior, the affected product is vulnerable to a direct attack due to a cross-site request…
CVE-2017-7926 — High (CVSS 8.8): A Cross-Site Request Forgery issue was discovered in OSIsoft PI Web API versions prior to 2017 (1.9.0). The…
CVE-2017-5153 — High (CVSS 7.8): An issue was discovered in OSIsoft PI Coresight 2016 R2 and earlier versions, and PI Web API 2016 R2 when deployed…
CVE-2019-13515 — Medium (CVSS 6.5): OSIsoft PI Web API 2018 and prior may allow disclosure of sensitive information.

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