Vulnerability Details : CVE-2020-15811

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.
Published 2020-09-02 17:15:12
Updated 2024-02-02 03:04:22
Source MITRE
View at NVD,   CVE.org

Products affected by CVE-2020-15811

Threat overview for CVE-2020-15811

Top countries where our scanners detected CVE-2020-15811
Top open port discovered on systems with this issue 3128
IPs affected by CVE-2020-15811 1,519,762
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2020-15811!
*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-2020-15811

EPSS FAQ
0.15%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 51 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-15811

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.0
 MEDIUM AV:N/AC:L/Au:S/C:N/I:P/A:N
8.0
2.9
 NIST
6.5
 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.8
3.6
 NIST

CWE ids for CVE-2020-15811

  • The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
    Assigned by: nvd@nist.gov (Primary)
  • The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-15811

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