Crash and memory disclosure via oversized broadcast payload
Published Aug 29, 2025 · Updated May 14, 2026
Stack-based out-of-bounds read in NetSupport Manager 14.x before 14.12.0000 allows remote attackers to crash the Windows Client or read memory. The BC_TCP_DATA handler trusts its payload-size field and copies beyond the 0x800-byte stack RX buffer into a broadcast slot. The Client listens on TCP port 5405, and unauthenticated broadcast commands expose adjacent stack memory; the flaw alone supports a crash or limited disclosure.
Summary
What happened
Stack-based out-of-bounds read in NetSupport Manager 14.x before 14.12.0000 allows remote attackers to crash the Windows Client or read memory. The BC_TCP_DATA handler trusts its payload-size field and copies beyond the 0x800-byte stack RX buffer into a broadcast slot. The Client listens on TCP port 5405, and unauthenticated broadcast commands expose adjacent stack memory; the flaw alone supports a crash or limited disclosure.
The record
- CVE
- CVE-2025-34165
- Published
- Aug 29, 2025
- Updated
- May 14, 2026
- Vendor
- NetSupport Ltd.
- Product
- NetSupport Manager
- Classifications
- CWE-121, CAPEC-100, T1210, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 29, 2025CVE publishedPublication date reported by the CVE source.
- May 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=14.0 <14.12.0000
What conditions does exploitation require?
What is affected?
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
- NetSupport Manager unauthenticated exploit chainfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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