How severe is CVE-2018-25221?

CVE-2018-25221 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-25221 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-25221?

CVE-2018-25221 affects Echatserver Easy Chat Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-25221?

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

Does CVE-2018-25221 have an EU (EUVD) identifier?

Yes. CVE-2018-25221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21700.

When was CVE-2018-25221 published?

CVE-2018-25221 was published on 2026-03-28 and last updated on 2026-06-17.

CVE-2018-25221

CVE-2018-25221 is a critical-severity vulnerability in Echatserver Easy Chat Server with a CVSS 3.x base score of 9.8. 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-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2018-21700
Weakness: CWE-787
Affected product: Echatserver Easy Chat Server
Published: 2026-03-28
Last modified: 2026-06-17

Description

EChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplying an oversized username parameter. Attackers can send a GET request to chat.ghp with a malicious username value containing shellcode and ROP gadgets to achieve code execution in the application context.

Frequently asked questions

What is CVE-2018-25221?: EChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplying an oversized username parameter. Attackers can send a GET request to chat.ghp with a malicious username value containing shellcode and ROP gadgets to achieve code execution in the application context.
How severe is CVE-2018-25221?: CVE-2018-25221 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-25221 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-25221?: CVE-2018-25221 affects Echatserver Easy Chat Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-25221?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2018-25221 have an EU (EUVD) identifier?: Yes. CVE-2018-25221 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-21700.
When was CVE-2018-25221 published?: CVE-2018-25221 was published on 2026-03-28 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Echatserver Easy Chat Server

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…
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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-2017-9557 — High (CVSS 7.5): register.ghp in EFS Software Easy Chat Server versions 2.0 to 3.1 allows remote attackers to discover passwords by…
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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