Vulnerability Name:

CVE-2021-33620 (CCN-202715)

Assigned:2021-05-10
Published:2021-05-10
Updated:2022-06-03
Summary:Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
6.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
6.5 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
5.7 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
6.8 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-20
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-33620

Source: MISC
Type: Mailing List, Patch, Vendor Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c.patch

Source: MISC
Type: Mailing List, Patch, Vendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-8af775ed98bfd610f9ce762fe177e01b2675588c.patch

Source: XF
Type: UNKNOWN
squidcache-cve202133620-dos(202715)

Source: CCN
Type: SQUID-2021:5
Denial of Service in HTTP Response processing

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-572g-rvwr-6c7f

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20210614 [SECURITY] [DLA 2685-1] squid3 security update

Source: FEDORA
Type: Third Party Advisory
FEDORA-2021-c0bec55ec7

Source: FEDORA
Type: Third Party Advisory
FEDORA-2021-24af72ff2c

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2021-33620

Vulnerable Configuration:Configuration 1:
  • cpe:/a:squid-cache:squid:*:*:*:*:*:*:*:* (Version >= 5.0 and < 5.0.6)
  • OR cpe:/a:squid-cache:squid:*:*:*:*:*:*:*:* (Version < 4.15)

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:squid-cache:squid:5.0:*:*:*:*:*:*:*
  • OR cpe:/a:squid-cache:squid:5.0.5:*:*:*:*:*:*:*
  • OR cpe:/a:squid-cache:squid:4.15:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:119456
    P
    		Security update for squid (Important)
    2022-07-26
    oval:org.opensuse.security:def:118774
    P
    		Security update for squid (Important)
    2022-07-26
    oval:org.opensuse.security:def:119641
    P
    		Security update for squid (Important)
    2022-07-26
    oval:org.opensuse.security:def:118964
    P
    		Security update for squid (Important)
    2022-07-26
    oval:org.opensuse.security:def:119269
    P
    		Security update for squid (Important)
    2022-07-26
    oval:org.opensuse.security:def:6094
    P
    		Security update for squid (Important)
    2022-07-12
    oval:org.opensuse.security:def:3527
    P
    		ipsec-tools-0.8.0-19.3.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:95157
    P
    		squid-5.4.1-150400.1.16 on GA media (Moderate)
    2022-06-22
    oval:com.redhat.rhsa:def:20214292
    P
    		RHSA-2021:4292: squid:4 security, bug fix, and enhancement update (Moderate)
    2021-11-09
    BACK
    squid-cache squid *
    squid-cache squid *
    fedoraproject fedora 33
    fedoraproject fedora 34
    debian debian linux 9.0
    squid-cache squid 5.0
    squid-cache squid 5.0.5
    squid-cache squid 4.15