|CVSS Meta Temp Score|
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|Current Exploit Price (≈)|
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|CTI Interest Score|
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A vulnerability classified as problematic has been found in Squid Web Proxy up to 4.14/5.0.5 (Firewall Software). Affected is some unknown functionality of the component Range Request Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. This is going to have an impact on availability. CVE summarizes:
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP Range request to trigger this.
The weakness was presented 05/28/2021. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2021-31808 since 04/26/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.
Upgrading to version 4.15 or 5.0.6 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at squid-cache.org. The best possible mitigation is suggested to be upgrading to the latest version.
CVSSv3VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1
VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
ExploitingClass: Denial of service
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceInterest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍
0-Day Time: 🔒
Upgrade: Web Proxy 4.15/5.0.6
Timeline04/26/2021 CVE assigned
05/28/2021 +32 days Advisory disclosed
05/28/2021 +0 days VulDB entry created
05/30/2021 +2 days VulDB last update
CVE: CVE-2021-31808 (🔒)
EntryCreated: 05/28/2021 06:25 AM
Updated: 05/30/2021 11:44 AM
Changes: (5) vulnerability_cvss2_vuldb_tempscore vulnerability_cvss3_meta_tempscore vulnerability_cvss3_vuldb_tempscore source_cve_assigned source_cve_nvd_summary
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