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No exploitation reportedFix available

CVE-2021-27196

No exploitation reported by the sources we read.

  • Published2021-06-14
  • Fixed in2.2.3.2 · 2.2.2.3 · 2.2.1.6 · 2.2.0.13 · 2.0.0.13 · 1.2.3.20
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Improper Input Validation vulnerability in Hitachi ABB Power Grids Relion 670 Series, Relion 670/650 Series, Relion 670/650/SAM600-IO, Relion 650, REB500, RTU500 Series, FOX615 (TEGO1), MSM, GMS600, PWC600 allows an attacker with access to the IEC 61850 network with knowledge of how to reproduce the attack, as well as the IP addresses of the different IEC 61850 access points (of IEDs/products), to force the device to reboot, which renders the device inoperable for approximately 60 seconds. This vulnerability affects only products with IEC 61850 interfaces. This issue affects: Hitachi ABB Power Grids Relion 670 Series 1.1; 1.2.3 versions prior to 1.2.3.20; 2.0 versions prior to 2.0.0.13; 2.1; 2.2.2 versions prior to 2.2.2.3; 2.2.3 versions prior to 2.2.3.2. Hitachi ABB Power Grids Relion 670/650 Series 2.2.0 versions prior to 2.2.0.13. Hitachi ABB Power Grids Relion 670/650/SAM600-IO 2.2.1 versions prior to 2.2.1.6. Hitachi ABB Power Grids Relion 650 1.1; 1.2; 1.3 versions prior to 1.3.0.7. Hitachi ABB Power Grids REB500 7.3; 7.4; 7.5; 7.6; 8.2; 8.3. Hitachi ABB Power Grids RTU500 Series 7.x version 7.x and prior versions; 8.x version 8.x and prior versions; 9.x version 9.x and prior versions; 10.x version 10.x and prior versions; 11.x version 11.x and prior versions; 12.x version 12.x and prior versions. Hitachi ABB Power Grids FOX615 (TEGO1) R1D02 version R1D02 and prior versions. Hitachi ABB Power Grids MSM 2.1.0 versions prior to 2.1.0. Hitachi ABB Power Grids GMS600 1.3.0 version 1.3.0 and prior versions. Hitachi ABB Power Grids PWC600 1.0 versions prior to 1.0.1.4; 1.1 versions prior to 1.1.0.1.

Timeline

dates in UTC
  1. 2021-06-1422:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27196?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27196?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Hitachienergy relion 670 firmwareversion to verify
BranchAffectedFixed in
2.2≥ 2.2.3, < 2.2.3.22.2.3.2
2.2≥ 2.2.2, < 2.2.2.32.2.2.3
2.2≥ 2.2.1, < 2.2.1.62.2.1.6
2.2≥ 2.2.0, < 2.2.0.132.2.0.13
2.0≥ 2.0, < 2.0.0.132.0.0.13
1.2≥ 1.2.3, < 1.2.3.201.2.3.20
1.1= 1.1no fix published
2.1= 2.1no fix published
Hitachienergy relion 650 firmwareversion to verify
BranchAffectedFixed in
2.2≥ 2.2.1, < 2.2.1.62.2.1.6
2.2≥ 2.2.0, < 2.2.0.132.2.0.13
1.3≥ 1.3, < 1.3.0.71.3.0.7
1.1= 1.1no fix published
1.2= 1.2no fix published
2.1= 2.1no fix published
Hitachienergy rtu500 firmwareversion to verify
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
9.0= 9.0no fix published
10.0= 10.0no fix published
11.0= 11.0no fix published
12.0= 12.0no fix published

6 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-21-096-01 CISA4 known affected

    Hitachi Energy Relion 670, 650 and SAM600-IO

    Relion 670 series: 1.1 | 1.2.3 | 2.0 | 2.1 | 2.2.2 | 2.2.3 · Relion 670/650 series: Version 2.2.0 · Relion 670/650/SAM600-IO series: Version 2.2.1 · +1 more

Full record on NVD

Fix

  1. Update Hitachienergy relion 670 firmware to 2.2.3.2 · 2.2.2.3 · 2.2.1.6 · 2.2.0.13 · 2.0.0.13 · 1.2.3.20
  2. Mitigation from the vendor CISA ICSA-21-096-01 · 4 productsHitachi ABB Power Grids recommends users apply relevant updates at their earliest convenience. Please contact Hitachi ABB Power Grids to acquire firmware on a specific product version. Hitachi ABB Power Grids has created these new versions to address vulnerability:
  3. Mitigation from the vendor CISA ICSA-21-096-01 · 4 productsPWC600 Version 1.0.1.4
  4. Mitigation from the vendor CISA ICSA-21-096-01 · 4 productsPWC600 Version 1.1.0.1
  5. Mitigation from the vendor CISA ICSA-21-096-01 · 4 productsGMS600 Version 1.3.1
  6. Mitigation from the vendor CISA ICSA-21-096-01 · 4 productsMSM Version 2.1.0+ (All older versions might be affected)
  7. Mitigation from the vendor CISA ICSA-21-096-01 · 4 productsFOX615 TEGO1 Version R2A16 and later

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CNACVSS 3.17.5read 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-10-22

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-06-14
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-27196?

Improper Input Validation vulnerability in Hitachi ABB Power Grids Relion 670 Series, Relion 670/650 Series, Relion 670/650/SAM600-IO, Relion 650, REB500, RTU500 Series, FOX615 (TEGO1), MSM, GMS600, PWC600 allows an attacker with access to the IEC 61850 network with knowledge of how to reproduce the attack, as well as the IP addresses of the different IEC 61850 access points (of IEDs/products), to force the device to reboot, which renders the device inoperable for approximately 60 seconds. This vulnerability affects only products with IEC 61850 interfaces. This issue affects: Hitachi ABB Power Grids Relion 670 Series 1.1; 1.2.3 versions prior to 1.2.3.20; 2.0 versions prior to 2.0.0.13; 2.1; 2.2.2 versions prior to 2.2.2.3; 2.2.3 versions prior to 2.2.3.2. Hitachi ABB Power Grids Relion 670/650 Series 2.2.0 versions prior to 2.2.0.13. Hitachi ABB Power Grids Relion 670/650/SAM600-IO 2.2.1 versions prior to 2.2.1.6. Hitachi ABB Power Grids Relion 650 1.1; 1.2; 1.3 versions prior to 1.3.0.7. Hitachi ABB Power Grids REB500 7.3; 7.4; 7.5; 7.6; 8.2; 8.3. Hitachi ABB Power Grids RTU500 Series 7.x version 7.x and prior versions; 8.x version 8.x and prior versions; 9.x version 9.x and prior versions; 10.x version 10.x and prior versions; 11.x version 11.x and prior versions; 12.x version 12.x and prior versions. Hitachi ABB Power Grids FOX615 (TEGO1) R1D02 version R1D02 and prior versions. Hitachi ABB Power Grids MSM 2.1.0 versions prior to 2.1.0. Hitachi ABB Power Grids GMS600 1.3.0 version 1.3.0 and prior versions. Hitachi ABB Power Grids PWC600 1.0 versions prior to 1.0.1.4; 1.1 versions prior to 1.1.0.1.

Is CVE-2021-27196 actively exploited?

Active exploitation of CVE-2021-27196 has not been confirmed. Its EPSS score was 1.6% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27196?

CVE-2021-27196 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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