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Vulnerability record · CVE-2017-9544 · published 12 June 2017

CVE-2017-9544: Echatserver easy chat server out-of-bounds write vulnerability

EEchatserver · Easy Chat Server

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.

9.8 CVSS 3.1 Critical EPSS 24% · top 2.2% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
24%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.exploit-db.com/exploits/42155/ ExploitThird Party AdvisoryVDB Entry
https://www.exploit-db.com/exploits/42155/ ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.3CVE-2018-25221Echatserver easy chat server out-of-bounds write vulnerabilityEChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplyin…EPSS 0.82%8.7CVE-2019-25613Echatserver easy chat server vulnerabilityEasy Chat Server 3.1 contains a denial of service vulnerability that allows remote attackers to crash the application by sending oversized data in th…EPSS 0.52%7.8CVE-2022-44939Echatserver easy chat server uncontrolled search path element vulnerabilityEfs Software Easy Chat Server Version 3.1 was discovered to contain a DLL hijacking vulnerability via the component TextShaping.dll. This vulnerabili…EPSS 0.39%7.5CVE-2019-20502Echatserver easy chat server classic buffer overflow vulnerabilityAn issue was discovered in EFS Easy Chat Server 3.1. There is a buffer overflow via a long body2.ghp message parameter.EPSS 1.1%7.5CVE-2017-9557Echatserver easy chat server insufficiently protected credentials vulnerabilityregister.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1 allows remote attackers to discover passwords by sending the username parameter in …EPSS 1.7%7.5CVE-2017-9543Echatserver easy chat server weak password recovery vulnerabilityregister.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1 allows remote attackers to reset arbitrary passwords via a crafted POST request to …EPSS 1.3%8.8CVE-2026-86950Apple ipados out-of-bounds write vulnerabilityAn out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1, …KEV8.8CVE-2026-53266Linux kernel ebtables SNAT out-of-bounds write in ARP rewriteThe ebtables SNAT target rewrites the ARP sender hardware address via skb_store_bits() without first making that range writable. When the ARP SHA byt…KEVEPSS 0.65%analysed

Source: NIST National Vulnerability Database (record CVE-2017-9544), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.