How severe is CVE-2020-12021?

CVE-2020-12021 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-12021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-12021?

CVE-2020-12021 primarily affects Osisoft Pi Web Api. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-12021?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-12021 published?

CVE-2020-12021 was published on 2020-06-23 and last updated on 2026-06-17.

CVE-2020-12021

CVE-2020-12021 is a critical-severity vulnerability in Osisoft Pi Web Api with a CVSS 3.x base score of 9.0. 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: Critical (CVSS 3.x base score 9.0)
CVSS v2: 6.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Osisoft Pi Web Api
Published: 2020-06-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-12021?: 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.
How severe is CVE-2020-12021?: CVE-2020-12021 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-12021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-12021?: CVE-2020-12021 primarily affects Osisoft Pi Web Api. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-12021?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-12021 published?: CVE-2020-12021 was published on 2020-06-23 and last updated on 2026-06-17.

References

https://www.us-cert.gov/ics/advisories/icsa-20-163-01

Affected products (2)

cpe:2.3:a:osisoft:pi_web_api:*:*:*:*:*:*:*:*
cpe:2.3:a:osisoft:pi_web_api:2019:patch_1:*:*:*:*:*:*

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-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-2021-43549 — Medium (CVSS 6.9): A remote authenticated attacker with write access to a PI Server could trick a user into interacting with a PI Web API…
CVE-2019-13515 — Medium (CVSS 6.5): OSIsoft PI Web API 2018 and prior may allow disclosure of sensitive information.

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