How severe is CVE-2020-24675?

CVE-2020-24675 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-24675 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-24675?

CVE-2020-24675 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-2020-24675?

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-2020-24675 published?

CVE-2020-24675 was published on 2020-12-22 and last updated on 2026-06-17.

CVE-2020-24675

CVE-2020-24675 is a critical-severity vulnerability in Abb Symphony + Historian with a CVSS 3.x base score of 9.8. 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-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Abb Symphony + Historian
Published: 2020-12-22
Last modified: 2026-06-17

Description

In S+ Operations and S+ History, it is possible that an unauthenticated user could inject values to the Operations History server (or standalone S+ History server) and ultimately write values to the controlled process.

Frequently asked questions

What is CVE-2020-24675?: In S+ Operations and S+ History, it is possible that an unauthenticated user could inject values to the Operations History server (or standalone S+ History server) and ultimately write values to the controlled process.
How severe is CVE-2020-24675?: CVE-2020-24675 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-24675 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-24675?: CVE-2020-24675 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-2020-24675?: 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-2020-24675 published?: CVE-2020-24675 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-2020-24673 — 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…
CVE-2020-24676 — High (CVSS 7.8): In Symphony Plus Operations and Symphony Plus Historian, some services can be vulnerable to privilege escalation…

All CVEs affecting Abb Symphony + Historian →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-20317 — Critical (CVSS 10.0): As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Workload engineering…
CVE-2026-19977 — Critical (CVSS 10.0): A vulnerability was detected in EFM ipTIME A3004T 14.19.0. The affected element is the function…
CVE-2026-59500 — Critical (CVSS 10.0): CWE-287: Improper Authentication
CVE-2024-27253 — Critical (CVSS 10.0): IBM DOORS Next 7.0.3 through 7.0.3 Interim Fix 018 could allow an authenticated user to bypass security logic to…
CVE-2026-56162 — Critical (CVSS 10.0): Improper authentication in Azure SQL Database allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-62825 — Critical (CVSS 10.0): Improper authentication in Azure Key Vault allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-287 (Improper Authentication) vulnerabilities →