CVE-2021-27418: GE UR family input validation
Noroxi assessment
Priority: Monitor (action score 24/100)
- 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: 0.60% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- According to the record, no fixed version is available yet.
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
GE UR firmware versions prior to version 8.1x supports web interface with read-only access. The device fails to properly validate user input, making it possible to perform cross-site scripting attacks, which may be used to send a malicious script. Also, UR Firmware web server does not perform HTML encoding of user-supplied strings.
- Published
- Mar 23, 2022
- Updated
- Jun 16, 2026
- EPSS
- 0.6% · 49th percentile
- CWE
- CWE-20
Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.1
- CNA · icscert
- 5.3
- 0.8 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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 |
|---|---|---|
| ge | multilin b30 firmware | cpe:2.3:o:ge:multilin_b30_firmware |
| ge | multilin b30 | cpe:2.3:h:ge:multilin_b30 |
| ge | multilin b90 firmware | cpe:2.3:o:ge:multilin_b90_firmware |
| ge | multilin b90 | cpe:2.3:h:ge:multilin_b90 |
| ge | multilin c60 firmware | cpe:2.3:o:ge:multilin_c60_firmware |
| ge | multilin c60 | cpe:2.3:h:ge:multilin_c60 |
| ge | multilin c70 firmware | cpe:2.3:o:ge:multilin_c70_firmware |
| ge | multilin c70 | cpe:2.3:h:ge:multilin_c70 |
| ge | multilin c95 firmware | cpe:2.3:o:ge:multilin_c95_firmware |
| ge | multilin c95 | cpe:2.3:h:ge:multilin_c95 |
| ge | multilin d30 firmware | cpe:2.3:o:ge:multilin_d30_firmware |
| ge | multilin d30 | cpe:2.3:h:ge:multilin_d30 |
and 26 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- ge multilin b30 firmwarebefore 8.10
- ge multilin b90 firmwarebefore 8.10
- ge multilin c30 firmwarebefore 8.10
- ge multilin c60 firmwarebefore 8.10
- ge multilin c70 firmwarebefore 8.10
- ge multilin c95 firmwarebefore 8.10
- ge multilin d30 firmwarebefore 8.10
- ge multilin d60 firmwarebefore 8.10
- ge multilin f35 firmwarebefore 8.10
- ge multilin f60 firmwarebefore 8.10
- ge multilin g30 firmwarebefore 8.10
- ge multilin g60 firmwarebefore 8.10
- ge multilin l30 firmwarebefore 8.10
- ge multilin l60 firmwarebefore 8.10
- ge multilin l90 firmwarebefore 8.10
- ge multilin m60 firmwarebefore 8.10
- ge multilin n60 firmwarebefore 8.10
- ge multilin t35 firmwarebefore 8.10
- ge multilin t60 firmwarebefore 8.10
Versions reported by the vendor
Affected version ranges reported by the assigning authority (icscert). Independent of NVD's CPE analysis and usually ahead of it.
GE UR family
- unspecified and later · before 8.1xaffected
Same product
ge: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-27428GE UR family Unrestricted Upload of File with Dangerous Type39Monitor
- CVE-2021-27426GE UR family insecure default variable initialization39Monitor
- CVE-2021-27422GE UR family exposure of sensitive information to an unauthorized actor30Monitor
Published before and after this one in the same product
- Later →CVE-2021-27420Mar 23, 2022 · GE UR family input validation21Monitor
- Later →CVE-2021-27424Mar 23, 2022 · GE UR family exposure of sensitive information to an unauthorized actor21Monitor
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).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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 (1 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.