CVE-1999-0635

The echo service is running.

Published: 1999-01-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0635 is rated Moderate Risk (59.3/100): medium exploitation likelihood (EPSS 1.03%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-1999-0635

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.76% 1.03% +0.27%
2 2025-03-30 0.90% 0.76% -0.15%
3 2025-03-29 — 0.90% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0635

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
0.0 2.0 LOW
AV:N/AC:L/Au:N/C:N/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 0.0 [email protected]

Weakness enumeration for CVE-1999-0635

NVD evaluator notes for CVE-1999-0635

Impact: This Common Vulnerabilities and Exposures (CVE) entry is a configuration issue and not a software flaw. As such, it doesn’t fit in the CVE software flaw list. The Common Vulnerability Scoring System (CVSS) base score for this CVE entry has been set to 0 because this CVE entry has no impact as a software flaw according to CVSS. This does not mean that the configuration issue is not important and there may be security implications relative to computers having this configuration.

Solution: The Echo Service is an unsecured and obsolete protocol and it should be disabled. Historically it has been used to perform denial of service attacks.

Affected software / configurations for CVE-1999-0635

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-1999-0635

cvelogic Threat Intelligence