CVE-2017-9544Easy Chat Server Out-of-Bounds Write
There is a remote stack-based buffer overflow (SEH) in register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1.
Published Jun 12, 2017 · Updated May 12, 2026
Key Facts
Patch immediately- CVE-2017-9544 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Easy Chat Server (Echatserver).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 24% probability of exploitation in the next 30 days.
- Fixed versions are available, including Easy Chat Server 3.1.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
24%
Higher than 97.8% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
51/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Description
There is a remote stack-based buffer overflow (SEH) in register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1. By sending an overly long username string to registresult.htm for registering the user, an attacker may be able to execute arbitrary code.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Easy Chat ServerEchatserver | See advisory | 3.1 |
Patched Releases
Easy Chat Server
3.1
Timeline
Publicly disclosed
Jun 12, 2017
Last updated
May 12, 2026
Weakness Type
- CWE-787 Out-of-bounds Write
References
- exploitMSF easychatserver_seh.rb
- exploit42155
FAQ
Common Questions.
There is a remote stack-based buffer overflow (SEH) in register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1.
Affected: Easy Chat Server (Echatserver). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Easy Chat Server 3.1.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2017-9544 On Your Attack Surface?
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