CVE-2021-22277 | AC 800M MMS - Denial of Service vulnerability in MMS communication

Improper Input Validation vulnerability in ABB 800xA, Control Software for AC 800M, Control Builder Safe, Compact Product Suite - Control and I/O, ABB Base Software for SoftControl allows an attacker to cause the denial of service.

Published: 2022-04-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-22277 is rated Moderate Risk (49.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.88%). Review affected assets and schedule 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-2021-22277

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 2026-06-15 0.37% 0.88% +0.52%
2 2026-03-30 0.55% 0.37% -0.18%
3 2025-11-21 — 0.55% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-22277

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
No account or special rights needed—anonymous or random user is enough.
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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2021-22277

Affected software / configurations for CVE-2021-22277

Vendor Product Version Raw CPE
abb 800xa >= 5.1.0-0, <= 5.1.0-3 cpe:2.3:a:abb:800xa:*:*:*:*:*:*:ac_800m:*
abb 800xa >= 5.1.1-0, <= 5.1.1-4 cpe:2.3:a:abb:800xa:*:*:*:*:*:*:ac_800m:*
abb 800xa >= 6.0.0-0, < 6.0.0-4 cpe:2.3:a:abb:800xa:*:*:*:*:*:*:ac_800m:*
abb 800xa >= 6.1.0-0, < 6.1.1-2 cpe:2.3:a:abb:800xa:*:*:*:*:*:*:ac_800m:*
abb base_software >= 5.1.0-0, <= 5.1.0-3 cpe:2.3:a:abb:base_software:*:*:*:*:*:softcontrol:*:*
abb base_software >= 5.1.1-0, <= 5.1.1-4 cpe:2.3:a:abb:base_software:*:*:*:*:*:softcontrol:*:*
abb base_software >= 6.0.0-0, <= 6.0.0-3 cpe:2.3:a:abb:base_software:*:*:*:*:*:softcontrol:*:*
abb base_software >= 6.1.0-0, <= 6.1.1-1 cpe:2.3:a:abb:base_software:*:*:*:*:*:softcontrol:*:*
abb compact_product_suite >= 5.1.0-0, <= 5.1.0-3 cpe:2.3:a:abb:compact_product_suite:*:*:*:*:*:*:*:*
abb compact_product_suite >= 5.1.1-0, <= 5.1.1-4 cpe:2.3:a:abb:compact_product_suite:*:*:*:*:*:*:*:*
abb compact_product_suite >= 6.0.0-0, <= 6.0.0-3 cpe:2.3:a:abb:compact_product_suite:*:*:*:*:*:*:*:*
abb compact_product_suite >= 6.1.0-0, <= 6.1.1-1 cpe:2.3:a:abb:compact_product_suite:*:*:*:*:*:*:*:*
abb control_builder_safe < 3.0 cpe:2.3:a:abb:control_builder_safe:*:*:*:*:*:*:*:*

References for CVE-2021-22277

cvelogic Threat Intelligence