CVE-2020-24674 | Improper Authorization in Symphony Plus

In S+ Operations and S+ Historian, not all client commands correctly check user permission as expected. Authenticated but Unauthorized remote users could execute a Denial-of-Service (DoS) attack, execute arbitrary code, or obtain more privilege than intended on the machines.

Published: 2020-12-22 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-24674 is rated High Risk (65.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.18%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-24674

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-24 4.81% 4.18% -0.63%
2 2025-03-30 8.98% 4.81% -4.17%
3 2025-03-29 — 8.98% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-24674

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
9.0 2.0 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 10.0 [email protected]

Weakness enumeration for CVE-2020-24674

Affected software / configurations for CVE-2020-24674

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

References for CVE-2020-24674

cvelogic Threat Intelligence