Calix GigaCenter ONT - Unauthenticated Telnet
Priority HIGH 73CWE-306Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.
Summary
Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00354 29th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Calix | GigaCenter ONT | 844E; 844G; 844GE; 854GE | — | No fix listed | CNA |
- GigaCenter ONT VendorCalix Affected 844E; 844G; 844GE; 854GE Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:calix:calix_gigacenter_ont:*:*:*:*:*:*:*:* | all versions | Vulnerable | Calix |
| cpe:2.3:a:calix:calix_gigacenter_ont:844e:*:*:*:*:*:*:* | 844e | Vulnerable | Calix |
| cpe:2.3:a:calix:calix_gigacenter_ont:844g:*:*:*:*:*:*:* | 844g | Vulnerable | Calix |
| cpe:2.3:a:calix:calix_gigacenter_ont:844ge:*:*:*:*:*:*:* | 844ge | Vulnerable | Calix |
| cpe:2.3:a:calix:calix_gigacenter_ont:854ge:*:*:*:*:*:*:* | 854ge | Vulnerable | Calix |
- cpe:2.3:a:calix:calix_gigacenter_ont:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Calix
- cpe:2.3:a:calix:calix_gigacenter_ont:844e:*:*:*:*:*:*:* Versions 844e Vulnerable ·Calix
- cpe:2.3:a:calix:calix_gigacenter_ont:844g:*:*:*:*:*:*:* Versions 844g Vulnerable ·Calix
- cpe:2.3:a:calix:calix_gigacenter_ont:844ge:*:*:*:*:*:*:* Versions 844ge Vulnerable ·Calix
- cpe:2.3:a:calix:calix_gigacenter_ont:854ge:*:*:*:*:*:*:* Versions 854ge Vulnerable ·Calix
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-7635
- 2026-10-03 Alias added: GHSA-7rr9-q3x5-6c5c
References
Sources
- CVE-2025-7635 · CVE Program
- CVE-2025-7635 · NVD
- FIRST EPSS
- GHSA-7rr9-q3x5-6c5c · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences