CVE-2018-25285Public exploit

Application crash via oversized authorization code

Published Apr 26, 2026 · Updated Apr 26, 2026

Buffer overflow in Fathom 2.4 allows local users to crash the application by entering an oversized Authorization Code and selecting Activate. The activation path copies the 6,000-byte field value without an effective size check, overflowing a destination buffer when the code is processed. Access to the local registration interface and user interaction are required; the demonstrated consequence is an application crash, not system compromise.

CVSS severity6.8
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Fathom 2.4 allows local users to crash the application by entering an oversized Authorization Code and selecting Activate. The activation path copies the 6,000-byte field value without an effective size check, overflowing a destination buffer when the code is processed. Access to the local registration interface and user interaction are required; the demonstrated consequence is an application crash, not system compromise.

The record

CVE
CVE-2018-25285
Published
Apr 26, 2026
Updated
Apr 26, 2026
Vendor
Concord Consortium
Product
Fathom
Classifications
CWE-120, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Concord Consortium · Fathomversion=2.4

Published CVSS scores

5.5VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.8VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

Public exploit references

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Technologies

Your stack

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Your stack

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