How severe is CVE-2017-9557?

CVE-2017-9557 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2017-9557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9557?

CVE-2017-9557 affects Echatserver Easy Chat Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9557?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-9557 published?

CVE-2017-9557 was published on 2017-06-12 and last updated on 2026-06-17.

CVE-2017-9557

CVE-2017-9557 is a high-severity vulnerability in Echatserver Easy Chat Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Echatserver Easy Chat Server
Published: 2017-06-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2017-9557?: 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.
How severe is CVE-2017-9557?: CVE-2017-9557 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2017-9557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9557?: CVE-2017-9557 affects Echatserver Easy Chat Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9557?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-9557 published?: CVE-2017-9557 was published on 2017-06-12 and last updated on 2026-06-17.

References

https://www.exploit-db.com/exploits/42153/

Affected products (1)

cpe:2.3:a:echatserver:easy_chat_server:*:*:*:*:*:*:*:*

More vulnerabilities in Echatserver Easy Chat Server

CVE-2018-25221 — Critical (CVSS 9.8): EChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to…
CVE-2017-9544 — Critical (CVSS 9.8): There is a remote stack-based buffer overflow (SEH) in register.ghp in EFS Software Easy Chat Server versions 2.0 to…
CVE-2022-44939 — High (CVSS 7.8): Efs Software Easy Chat Server Version 3.1 was discovered to contain a DLL hijacking vulnerability via the component…
CVE-2019-25613 — High (CVSS 7.5): Easy Chat Server 3.1 contains a denial of service vulnerability that allows remote attackers to crash the application…
CVE-2019-20502 — High (CVSS 7.5): An issue was discovered in EFS Easy Chat Server 3.1. There is a buffer overflow via a long body2.ghp message parameter.
CVE-2017-9543 — High (CVSS 7.5): register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1 allows remote attackers to reset arbitrary passwords…

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