Executive Summary

Name CVE-2020-15811 First vendor Publication 2020-09-02
Vendor Cve Last vendor Modification 2021-02-19

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Overall CVSS Score 6.5
Base Score 6.5 Environmental Score 6.5
impact SubScore 3.6 Temporal Score 6.5
Exploitabality Sub Score 2.8
Attack Vector Network Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact High Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:N/I:P/A:N)
Cvss Base Score 4 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 8 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores


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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15811

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

CPE : Common Platform Enumeration

Application 306
Os 1
Os 1
Os 2
Os 2

Sources (Detail)

Source Url
CONFIRM https://security.netapp.com/advisory/ntap-20210219-0007/
DEBIAN https://www.debian.org/security/2020/dsa-4751
FEDORA https://lists.fedoraproject.org/archives/list/package-announce@lists.fedorapr...
MISC https://github.com/squid-cache/squid/security/advisories/GHSA-c7p8-xqhm-49wv
MLIST https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
SUSE http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html
UBUNTU https://usn.ubuntu.com/4477-1/

Alert History

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Date Informations
2021-02-19 17:22:46
  • Multiple Updates
2020-10-03 00:22:57
  • Multiple Updates
2020-10-01 05:22:51
  • Multiple Updates
2020-09-26 00:22:48
  • Multiple Updates
2020-09-11 09:22:48
  • Multiple Updates
2020-09-07 21:23:04
  • Multiple Updates
2020-09-06 00:22:47
  • Multiple Updates
2020-09-04 00:22:48
  • Multiple Updates
2020-09-02 21:23:15
  • First insertion