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CVE-2025-7635

25
FAUCET Score

CVE-2025-7635 describes an unauthenticated Telnet access vulnerability in specific Calix GigaCenter ONT models (844E, 844G, 844GE, 854GE) that grants root access. With a CVSS score of 7.7 (HIGH), this vulnerability is easily exploitable locally with low attack complexity, allowing for complete compromise of confidentiality and integrity. There is currently no public exploit intelligence, active exploitation, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:a:calix:calix_gigacenter_ont:*:*:*:*:*:*:*:*
844eCPE matchmatch criteria
cpe:2.3:a:calix:calix_gigacenter_ont:844e:*:*:*:*:*:*:*
844gCPE matchmatch criteria
cpe:2.3:a:calix:calix_gigacenter_ont:844g:*:*:*:*:*:*:*
844geCPE matchmatch criteria
cpe:2.3:a:calix:calix_gigacenter_ont:844ge:*:*:*:*:*:*:*
854geCPE matchmatch criteria
cpe:2.3:a:calix:calix_gigacenter_ont:854ge:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.7HIGH

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.27%
Probability of exploitation in next 30 days
EPSS Percentile
19.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0027 is in the 19th percentile among its peer group of 3,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.5 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

fluidattacks.com / advisories/sal
ExploitMitigationThird Party Advisory
revers3everything.com / calix-case-five-0-days-five-cves
Third Party Advisory
calix.com
Product