Unauthenticated service crash via oversized SFTP username
Published Apr 5, 2021 · Updated Aug 4, 2024
Buffer overflow in Core FTP Server v2 Build 697 allows remote attackers to crash the service through a crafted SFTP username. The SFTP username handler accepts oversized input during SSH-key authentication and writes beyond its buffer, corrupting process memory. SSH-key authentication must be enabled, but no valid account or configured key is required; the demonstrated consequence for this build is a service crash.
Summary
What happened
Buffer overflow in Core FTP Server v2 Build 697 allows remote attackers to crash the service through a crafted SFTP username. The SFTP username handler accepts oversized input during SSH-key authentication and writes beyond its buffer, corrupting process memory. SSH-key authentication must be enabled, but no valid account or configured key is required; the demonstrated consequence for this build is a service crash.
The record
- CVE
- CVE-2020-19595
- Published
- Apr 5, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 5, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Oversized SFTP username denial-of-service exploitfunctional · demonstrated
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Technologies
Your stack
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Your stack
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