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CVE-2021-22283· NVD / CVE Program· CNA ABB

MMS File Transfer Vulnerability impact on Distribution Automation products

Improper Initialization vulnerability in ABB Relion protection relays - 611 series, ABB Relion protection relays - 615 series IEC 4.0 FP1, ABB Relion protection relays - 615 series CN 4.0 FP1, ABB Relion protection relays - 615 series IEC 5.0, ABB Relion protection relays - 615 series IEC 5.0 FP1, ABB Relion protection relays - 620 series IEC/CN 2.0, ABB Relion protection relays - 620 series IEC/CN 2.0 FP1, ABB Relion protection relays - REX640 PCL1, ABB Relion protection relays - REX640 PCL2, ABB Relion protection relays - REX640 PCL3, ABB Relion protection relays - RER615, ABB Remote Monitoring and Control - REC615, ABB Merging Unit- SMU615 allows Communication Channel Manipulation.This issue affects Relion protection relays - 611 series: from 1.0.0 before 2.0.3; Relion protection relays - 615 series IEC 4.0 FP1: from 4.1.0 before 4.1.9; Relion protection relays - 615 series CN 4.0 FP1: from 4.1.0 before 4.1.8; Relion protection relays - 615 series IEC 5.0: from 5.0.0 before 5.0.12; Relion protection relays - 615 series IEC 5.0 FP1: from 5.1.0 before 5.1.20; Relion protection relays - 620 series IEC/CN 2.0: from 2.0.0 before 2.0.11; Relion protection relays - 620 series IEC/CN 2.0 FP1: from 2.1.0 before 2.1.15; Relion protection relays - REX640 PCL1: from 1.0.0 before 1.0.8; Relion protection relays - REX640 PCL2: from 1.1.0 before 1.1.4; Relion protection relays - REX640 PCL3: from 1.2.0 before 1.2.1; Relion protection relays - RER615: from 2.0.0 before 2.0.3; Remote Monitoring and Control - REC615: from 1.0.0 before 2.0.3; Merging Unit- SMU615: from 1.0.0 before 1.0.2.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 28, 2023
Updated
Jun 16, 2026
EPSS
0.2% · 6th percentile
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JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · ABB
6.2
0.7 point gap

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
abbsmu615 firmware
abbsmu615
abbrec615 firmware
abbrec615
abbrer615 firmware
abbrer615
abbevd4 firmware
abbevd4
abbref615r firmware
abbref615r
abbrex640 pcl3 firmware
abbrex640 pcl3

and 26 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • abb evd4 firmwareall versions
  • abb rec615 firmwarebefore 2.0.3
  • abb red615 iec firmwareall versions
  • abb ref615 ansi firmwareall versions
  • abb ref615 iec firmwareall versions
  • abb ref615r firmwareall versions
  • abb relion 611 firmwarebefore 2.0.3
  • abb relion 615 ansi firmwareall versions
  • abb relion 615 cn firmwareall versions
  • abb relion 615 cn firmwarebefore 4.1.8
  • abb relion 615 iec firmwarebefore 4.1.9
  • abb relion 615 iec firmwarebefore 5.0.12
  • abb relion 615 iec firmwarebefore 5.1.20
  • abb relion 615 iec firmwareall versions
  • abb relion 620 ansi firmwareall versions
  • abb relion 620 cn firmwarebefore 2.1.15
  • abb relion 620 cn firmwarebefore 2.0.11
  • abb relion 620 iec firmwarebefore 2.1.15
  • abb relion 620 iec firmwarebefore 2.0.11
  • abb rer615 firmwarebefore 2.0.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (ABB). Independent of NVD's CPE analysis and usually ahead of it.

  • ABB Merging Unit- SMU615

    • 1.0.0 and later · before 1.0.2affected · firmware

  • ABB Relion protection relays - 611 series

    • 1.0.0 and later · before 2.0.3affected · firmware

  • ABB Relion protection relays - 615 series CN 4.0 FP1

    • 4.1.0 and later · before 4.1.8affected · firmware

  • ABB Relion protection relays - 615 series IEC 4.0 FP1

    • 4.1.0 and later · before 4.1.9affected · firmware

  • ABB Relion protection relays - 615 series IEC 5.0

    • 5.0.0 and later · before 5.0.12affected · firmware

  • ABB Relion protection relays - 615 series IEC 5.0 FP1

    • 5.1.0 and later · before 5.1.20affected · firmware

  • ABB Relion protection relays - 620 series IEC/CN 2.0

    • 2.0.0 and later · before 2.0.11affected · firmware

  • ABB Relion protection relays - 620 series IEC/CN 2.0 FP1

    • 2.1.0 and later · before 2.1.15affected · firmware

  • ABB Relion protection relays - RER615

    • 2.0.0 and later · before 2.0.3affected · firmware

  • ABB Relion protection relays - REX640 PCL1

    • 1.0.0 and later · before 1.0.8affected · firmware

  • ABB Relion protection relays - REX640 PCL2

    • 1.1.0 and later · before 1.1.4affected · firmware

  • ABB Relion protection relays - REX640 PCL3

    • 1.2.0 and later · before 1.2.1affected · firmware

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
ABB Merging Unit- SMU6151.0.2Vendor (CNA)
ABB Relion protection relays - 611 series2.0.3Vendor (CNA)
ABB Relion protection relays - 615 series CN 4.0 FP14.1.8Vendor (CNA)
ABB Relion protection relays - 615 series IEC 4.0 FP1 4.1.9Vendor (CNA)
ABB Relion protection relays - 615 series IEC 5.05.0.12Vendor (CNA)
ABB Relion protection relays - 615 series IEC 5.0 FP15.1.20Vendor (CNA)
ABB Relion protection relays - 620 series IEC/CN 2.02.0.11Vendor (CNA)
ABB Relion protection relays - 620 series IEC/CN 2.0 FP12.1.15Vendor (CNA)
ABB Relion protection relays - RER6152.0.3Vendor (CNA)
ABB Relion protection relays - REX640 PCL11.0.8Vendor (CNA)
ABB Relion protection relays - REX640 PCL21.1.4Vendor (CNA)
ABB Relion protection relays - REX640 PCL31.2.1Vendor (CNA)
ABB Remote Monitoring and Control - REC6152.0.3Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-665 · Improper Initialization

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records