CVE-2021-27196: Specially Crafted IEC 61850 Protocol Sequence Vulnerability
Noroxi assessment
Priority: Monitor (action score 30/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.5% (FIRST EPSS); higher than 75.6% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to the record, no fixed version is available yet.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Update when a fix is released; follow the vendor's advisory.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Jun 14, 2021
- Updated
- Jun 16, 2026
- EPSS
- 1.5% · 75th percentile
- CWE
- CWE-20
Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.5%
CNA vs NVD score
- NVD
- 7.5
- CNA · mitre
- 7.5
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- No fixed version yet
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| hitachienergy | relion 670 firmware | cpe:2.3:o:hitachienergy:relion_670_firmware |
| hitachienergy | relion 670 | cpe:2.3:h:hitachienergy:relion_670 |
| hitachienergy | relion 650 firmware | cpe:2.3:o:hitachienergy:relion_650_firmware |
| hitachienergy | relion 650 | cpe:2.3:h:hitachienergy:relion_650 |
| hitachienergy | relion sam600-io firmware | cpe:2.3:o:hitachienergy:relion_sam600-io_firmware |
| hitachienergy | relion sam600-io | cpe:2.3:h:hitachienergy:relion_sam600-io |
| hitachienergy | rtu500 firmware | cpe:2.3:o:hitachienergy:rtu500_firmware |
| hitachienergy | rtu500 | cpe:2.3:h:hitachienergy:rtu500 |
| hitachienergy | reb500 firmware | cpe:2.3:o:hitachienergy:reb500_firmware |
| hitachienergy | reb500 | cpe:2.3:h:hitachienergy:reb500 |
| hitachienergy | fox615 tego1 firmware | cpe:2.3:o:hitachienergy:fox615_tego1_firmware |
| hitachienergy | fox615 tego1 | cpe:2.3:h:hitachienergy:fox615_tego1 |
and 6 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- hitachienergy fox615 tego1 firmwarebefore r2a16
- hitachienergy gms600 firmwareup to 1.3.0 inclusive
- hitachienergy modular switchgear monitoring firmwarebefore 2.1.0
- hitachienergy pwc600 firmware1.0 and later · before 1.0.1.4
- hitachienergy pwc600 firmware1.1 and later · before 1.1.0.1
- hitachienergy reb500 firmware7.3 and later · before 7.60.19
- hitachienergy reb500 firmware8.3 and later · up to 8.3.1.0 inclusive
- hitachienergy reb500 firmware8.2 and later · before 8.2.0.5
- hitachienergy relion 650 firmware1.3 and later · before 1.3.0.7
- hitachienergy relion 650 firmware2.2.0 and later · before 2.2.0.13
- hitachienergy relion 650 firmware2.2.1 and later · before 2.2.1.6
- hitachienergy relion 650 firmware1.1
- hitachienergy relion 650 firmware1.2
- hitachienergy relion 650 firmware2.1
- hitachienergy relion 670 firmware1.2.3 and later · before 1.2.3.20
- hitachienergy relion 670 firmware2.0 and later · before 2.0.0.13
- hitachienergy relion 670 firmware2.2.0 and later · before 2.2.0.13
- hitachienergy relion 670 firmware2.2.1 and later · before 2.2.1.6
- hitachienergy relion 670 firmware2.2.2 and later · before 2.2.2.3
- hitachienergy relion 670 firmware2.2.3 and later · before 2.2.3.2
Same product
hitachienergy: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-18253An attacker could use specially crafted paths in a specific request to read or delete files from Relion 670 Series (versions 1p1r26, 1.2.3.141Plan
- CVE-2021-35535Insufficient Security Control Vulnerability32Monitor
- CVE-2023-4518A vulnerability exists in the input validation of the GOOSE
messages where out of range values received and processed
by the IED caused a 30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
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.
No history yet (it accumulates with the daily EPSS job).
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 researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
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
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-21-0482 · Jun 15, 2021(Hitachi ABB Power Grids Endüstriyel Güvenlik Bildirimi)
- TR-21-0291 · Apr 7, 2021(Hitachi ABB Power Grids Endüstriyel Güvenlik Bildirimi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- 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
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/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.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Show all references (6 more)Show less
- search.abb.com/library/Download.aspx?DocumentID=9AKK107991A8934&LanguageCode=en&DocumentPartId=&Action=Launch
- search.abb.com/library/Download.aspx?DocumentID=9AKK107991A8936&LanguageCode=en&DocumentPartId=&Action=Launch
- search.abb.com/library/Download.aspx?DocumentID=9AKK107991A8937&LanguageCode=en&DocumentPartId=&Action=Launch
- search.abb.com/library/Download.aspx?DocumentID=9AKK107991A9057&LanguageCode=en&DocumentPartId=&Action=Launch
- search.abb.com/library/Download.aspx?DocumentID=9AKK107991A9058&LanguageCode=en&DocumentPartId=&Action=Launch
- search.abb.com/library/Download.aspx?DocumentID=9AKK107991A9059&LanguageCode=en&DocumentPartId=&Action=Launch
Vendor advisories and official records. Exploit/PoC links are deliberately left out.