CVE-2025-7635

HIGHNVD 7.77.7—Elevated

7.7

Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.

CVSS v3: 7.7
EG Score: 7.7(medium)
EPSS: 10.6%
KEV: Not listed

Published

September 9, 2025

Last Modified

December 22, 2025

References (4)

help@fluidattackshttps://fluidattacks.com/advisories/sal
help@fluidattackshttps://revers3everything.com/calix-case-five-0-days-five-cves/
help@fluidattackshttps://www.calix.com
134c704f-9b21-4f2e-91b3-4a467353bcc0https://fluidattacks.com/advisories/sal

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-306Missing Authentication for Critical Function

Data Freshness Timeline

(refreshed 13× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:47 UTCepss_batch
2026-06-05 22:46 UTCepss_batch
2026-06-05 06:10 UTCepss_batch
2026-06-05 06:10 UTCepss_batch
2026-06-04 13:12 UTCepss_batch
2026-06-04 13:12 UTCepss_batch
2026-06-02 20:13 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 23:06 UTCEG score recompute
2026-05-29 23:05 UTCGHSA enrichment
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch

Frequently asked(5)

What is CVE-2025-7635?

CVE-2025-7635 is a high vulnerability published on September 9, 2025. Unauthenticated Telnet access vulnerability in Calix GigaCenter ONT allows root access.This issue affects GigaCenter ONT: 844E, 844G, 844GE, 854GE.

When was CVE-2025-7635 disclosed?

CVE-2025-7635 was first published in the National Vulnerability Database on September 9, 2025, with the most recent update on December 22, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-7635 actively exploited?

CVE-2025-7635 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-7635?

CVE-2025-7635 has a CVSS v3 base score of 7.7 (NVD).

How do I remediate CVE-2025-7635?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-7635, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-7635

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-7635?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)