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Description

Fathom 2.4 contains a buffer overflow vulnerability in the Authorization Code field that allows local attackers to crash the application by submitting an oversized input string. Attackers can paste a 6000-byte payload into the Authorization Code field and click Activate to trigger a denial of service condition.

PUBLISHED Reserved 2026-04-26 | Published 2026-04-26 | Updated 2026-04-27 | Assigner VulnCheck




MEDIUM: 6.8CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
MEDIUM: 5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Product status

2.4
affected

Credits

Gionathan "John" Reale finder

References

www.exploit-db.com/exploits/45294 (ExploitDB-45294) exploit

fathom.concord.org/ (Official Product Homepage) product

fathom.concord.org/download/ (Product Reference) product

www.vulncheck.com/...-via-authorization-code-buffer-overflow (VulnCheck Advisory: Fathom 2.4 Denial of Service via Authorization Code Buffer Overflow) third-party-advisory

cve.org (CVE-2018-25285)

nvd.nist.gov (CVE-2018-25285)

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