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CVE-2023-53959

34
FAUCET Score

CVE-2023-53959 is a critical DLL hijacking vulnerability in FileZilla Client 3.63.1, allowing unauthenticated attackers to achieve remote code execution. By placing a specially crafted TextShaping.dll in the application directory, an attacker can execute malicious code when the client launches. This vulnerability carries a CVSS score of 9.8 (Critical) due to its network attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there are no known active exploits or public exploit modules like Metasploit or Nuclei, the vulnerability has garnered significant community discussion, indicating potential interest in developing exploits.

Impacted Technologies

VendorProductVersion(s)CPE
3.63.1CPE matchmatch criteria
cpe:2.3:a:filezilla-project:filezilla_client:3.63.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.5HIGH

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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
LOW
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
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 34th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

filezilla-project.org
Product
exploit-db.com / exploits/51267
ExploitThird Party AdvisoryVDB Entry
vulncheck.com / advisories/filezilla-client-dll-hijacking-via-missing-textshapingdll
Third Party Advisory