CVE-2025-63729Public exploit

Key disclosure via extractable firmware PEM files

Published Nov 25, 2025 · Updated Nov 25, 2025

Cleartext secret storage in Syrotech SY-GPON-1110-WDONT firmware 3.1.02-240517 allows local users to extract TLS keys and certificates. The firmware filesystem stores the SSL private key, CA certificate, server certificate, and client certificates as PEM files under /etc. Access to the firmware image is required; recovered private and client keys expose certificate-based identities and protected communications that rely on them.

CVSS severity9.0
Critical
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext secret storage in Syrotech SY-GPON-1110-WDONT firmware 3.1.02-240517 allows local users to extract TLS keys and certificates. The firmware filesystem stores the SSL private key, CA certificate, server certificate, and client certificates as PEM files under /etc. Access to the firmware image is required; recovered private and client keys expose certificate-based identities and protected communications that rely on them.

The record

CVE
CVE-2025-63729
Published
Nov 25, 2025
Updated
Nov 25, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200, CWE-312, CWE-532, T1552.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-312Cleartext Storage of Sensitive Information
CWE-532Insertion of Sensitive Information into Log File
T1552.004Private Keys

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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