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CVE-2019-25634

27
FAUCET Score

CVE-2019-25634 identifies a stack-based buffer overflow vulnerability in Base64 Decoder version 1.1.2. This flaw allows local attackers to achieve arbitrary code execution by crafting a malicious input file that overwrites the Structured Exception Handler (SEH) chain. It carries a CVSSv3 score of 8.4 (High), indicating a significant risk due to its local attack vector, low attack complexity, and high impact on system confidentiality, integrity, and availability. There is currently no evidence of active exploitation, nor are public exploit modules or significant community discussion available for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
1.1.2CPE matchmatch criteria
cpe:2.3:a:4mhz:base64_decoder:1.1.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.6HIGH

CVSS:4.0/AV:L/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
LOCAL
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
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
17.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 18th percentile among its peer group of 3,237 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

4mhz.de / b64dec.html
ProductRelease Notes
4mhz.de / download.php
Product
exploit-db.com / exploits/46625
Exploit
vulncheck.com / advisories/base64-decoder-local-buffer-overflow-seh-egghunter
Third Party Advisory