Vulnerability · Published Jan 29, 2026 · Assigned by VulnCheck
CVE-2020-36997BacklinkSpeed 2.4 - Buffer Overflow PoC (SEH)
Critical 9.8
In plain English
A critical-severity stack buffer overflow in BacklinkSpeed from Dummysoftware. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 65.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
BacklinkSpeed 2.4 contains a buffer overflow vulnerability that allows attackers to corrupt the Structured Exception Handler (SEH) chain through malicious file import. Attackers can craft a specially designed payload file to overwrite SEH addresses, potentially executing arbitrary code and gaining control of the application.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Dummysoftware | BacklinkSpeed | 2.4 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-48726 exploit
- Vendor Homepage product
- Software Download Page product
- VulnCheck Advisory: BacklinkSpeed 2.4 - Buffer Overflow PoC (SEH) third-party-advisory