How severe is CVE-2020-24676?

CVE-2020-24676 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-24676 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-24676?

CVE-2020-24676 primarily affects Abb Symphony + Historian. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-24676?

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

When was CVE-2020-24676 published?

CVE-2020-24676 was published on 2020-12-22 and last updated on 2026-06-17.

CVE-2020-24676

CVE-2020-24676 is a high-severity vulnerability in Abb Symphony + Historian with a CVSS 3.x base score of 7.8. 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-274.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-274
Affected product: Abb Symphony + Historian
Published: 2020-12-22
Last modified: 2026-06-17

Description

In Symphony Plus Operations and Symphony Plus Historian, some services can be vulnerable to privilege escalation attacks. An unprivileged (but authenticated) user could execute arbitrary code and result in privilege escalation, depending on the user that the service runs as.

Frequently asked questions

What is CVE-2020-24676?: In Symphony Plus Operations and Symphony Plus Historian, some services can be vulnerable to privilege escalation attacks. An unprivileged (but authenticated) user could execute arbitrary code and result in privilege escalation, depending on the user that the service runs as.
How severe is CVE-2020-24676?: CVE-2020-24676 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-24676 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-24676?: CVE-2020-24676 primarily affects Abb Symphony + Historian. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-24676?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-24676 published?: CVE-2020-24676 was published on 2020-12-22 and last updated on 2026-06-17.

References

Affected products (10)

cpe:2.3:a:abb:symphony_\+_historian:3.0:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_historian:3.1:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:1.1:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:2.0:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:2.1:sp1:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:2.1:sp2:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:3.0:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:3.1:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:3.2:*:*:*:*:*:*:*
cpe:2.3:a:abb:symphony_\+_operations:3.3:*:*:*:*:*:*:*

More vulnerabilities in Abb Symphony + Historian

CVE-2020-24683 — Critical (CVSS 9.8): The affected versions of S+ Operations (version 2.1 SP1 and earlier) used an approach for user authentication which…
CVE-2020-24675 — Critical (CVSS 9.8): In S+ Operations and S+ History, it is possible that an unauthenticated user could inject values to the Operations…
CVE-2020-24673 — Critical (CVSS 9.8): In S+ Operations and S+ Historian, a successful SQL injection exploit can read sensitive data from the database, modify…
CVE-2020-24678 — High (CVSS 8.8): An authenticated user might execute malicious code under the user context and take control of the system. S+ Operations…
CVE-2020-24677 — High (CVSS 8.8): Vulnerabilities in the S+ Operations and S+ Historian web applications can lead to a possible code execution and…
CVE-2020-24674 — High (CVSS 8.8): In S+ Operations and S+ Historian, not all client commands correctly check user permission as expected. Authenticated…

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