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Vulnerability record · CVE-2017-9557 · published 12 June 2017

CVE-2017-9557: Echatserver easy chat server insufficiently protected credentials vulnerability

EEchatserver · Easy Chat Server

register.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 conjunction with an empty password parameter, and reading the HTML source code of the response.

7.5 CVSS 3.1 High EPSS 1.7% · top 24.1% CWE-522 · Insufficiently protected credentials
7.5CVSS 3.1 base score, v2 5.0
1.7%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

register.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 conjunction with an empty password parameter, and reading the HTML source code of the response.

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

Affected products

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

References

LinkTags
https://www.exploit-db.com/exploits/42153/ ExploitThird Party AdvisoryVDB Entry
https://www.exploit-db.com/exploits/42153/ ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

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

9.8CVE-2017-9544Echatserver easy chat server out-of-bounds write vulnerabilityThere 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 u…EPSS 24%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-2017-9543Echatserver 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%9.8CVE-2021-22681Rockwell Logix Designer authentication bypass via weak key verificationRockwell Automation Studio 5000 Logix Designer (v21+) and RSLogix 5000 (v16-20) rely on a key to verify that Logix controllers are talking to genuine…KEVEPSS 64%analysed9.8CVE-2021-30116Kaseya VSA credential disclosure via unauthenticated download pageKaseya VSA before 9.5.7 exposes an unauthenticated download page (dl.asp) that leaks agent credentials and accepts them via GET request. An attacker …KEVEPSS 86%analysed

Source: NIST National Vulnerability Database (record CVE-2017-9557), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.