An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.
Published 2021-05-27 12:15:08
Updated 2023-10-24 14:43:33
Source MITRE
View at NVD,   CVE.org
Vulnerability category: Denial of service

Threat overview for CVE-2021-28651

Top countries where our scanners detected CVE-2021-28651
Top open port discovered on systems with this issue 3128
IPs affected by CVE-2021-28651 3,234,457
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2021-28651!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-28651

1.55%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 87 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-28651

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
5.0
MEDIUM AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
NIST
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
NIST

CWE ids for CVE-2021-28651

References for CVE-2021-28651

Products affected by CVE-2021-28651

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