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Fencer Vulns
high 7.3

CVE-2020-8473 json

ABB System 800xA Weak File Permissions - ABB System 800xA Base

published 2020-04-28 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29339

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

Insufficient folder permissions used by system functions in ABB System 800xA Base (version 6.1 and earlier) allow low privileged users to read, modify, add and delete system and application files. An authenticated attacker who successfully exploit the vulnerabilities could escalate his/her privileges, cause system functions to stop and to corrupt user applications.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-154-01 updated cvss 7.3

ABB System 800xA

  • ABB System 800xA Base <= 6.1 ABB Base Software for SoftControl <= 6.1 ABB Control Builder M Professional <= 6.1 ABB MMS Server for AC 800M <= 6.1 ABB OPC Server for AC 800M <= 6.0
    affected: vendor fix, mitigation “ABB recommends changing any user account passwords suspected to be known by an unauthorized person. Interactive logon (both local and remote) is recommended to be disabled for the service account.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:L/AC:L/Au:N/C:P/I:C/A:C

Affected products

  • ABB System 800xA Base

Classification

Weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.