Fathom 2.4 Denial of Service via Authorization Code Buffer Overflow
Published Apr 26, 2026
6.8
MEDIUMCVSS 4.0
EPSS 0.13%
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.
Affected products
-
- Version 2.4StatusaffectedConstraints-
- Version
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/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
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Apr 27, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Apr–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.13% (0.00130) | 2.21th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.13% (0.00130) | 2.89th | v5 (v2026.06.15) |
| Apr 27, 2026 | 0.01% (0.00012) | 1.63th | v4 (v2025.03.14) |
References (4)
- https://fathom.concord.org/ product
- https://fathom.concord.org/download/ product
- https://www.exploit-db.com/exploits/45294 exploit
- https://www.vulncheck.com/advisories/fathom-denial-of-service-via-authorization-code-buffer-overflow third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| https://fathom.concord.org/ | product | |
| https://fathom.concord.org/download/ | product | |
| https://www.exploit-db.com/exploits/45294 | exploit | |
| https://www.vulncheck.com/advisories/fathom-denial-of-service-via-authorization-code-buffer-overflow | third-party-advisory |
Change history (0)
No recorded changes yet.