CVE-2020-24686
CVE-2020-24686 is a high-severity vulnerability in Abb Pm554 Firmware with a CVSS 3.x base score of 7.5. 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-400.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (70th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-400
- Affected product: Abb Pm554 Firmware
- Published:
- Last modified:
Description
The vulnerabilities can be exploited to cause the web visualization component of the PLC to stop and not respond, leading to genuine users losing remote visibility of the PLC state. If a user attempts to login to the PLC while this vulnerability is exploited, the PLC will show an error state and refuse connections to Automation Builder. The execution of the PLC application is not affected by this vulnerability. This issue affects ABB AC500 V2 products with onboard Ethernet.
Frequently asked questions
- What is CVE-2020-24686?
- The vulnerabilities can be exploited to cause the web visualization component of the PLC to stop and not respond, leading to genuine users losing remote visibility of the PLC state. If a user attempts to login to the PLC while this vulnerability is exploited, the PLC will show an error state and refuse connections to Automation Builder. The execution of the PLC application is not affected by this vulnerability. This issue affects ABB AC500 V2 products with onboard Ethernet.
- How severe is CVE-2020-24686?
- CVE-2020-24686 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2020-24686 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-24686?
- CVE-2020-24686 primarily affects Abb Pm554 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-24686?
- 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-2020-24686 published?
- CVE-2020-24686 was published on 2021-02-26 and last updated on 2026-06-17.
References
Affected products (6)
- cpe:2.3:o:abb:pm554_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:abb:pm556_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:abb:pm564_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:abb:pm566_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:abb:pm572_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:abb:pm573_firmware:-:*:*:*:*:*:*:*
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