Undertow HTTP Request HTTP/1.x request smuggling

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CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.07

A vulnerability was found in Undertow (the affected version unknown). It has been classified as critical. This affects an unknown part of the file HTTP/1.x of the component HTTP Request Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-444. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.

The weakness was presented 02/23/2021. The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2021-20220 since 12/17/2020. The exploitability is told to be easy. The attack needs to be done within the local network. A authentication is necessary for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/04/2021).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.8
NVD Vector: 🔒

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-444
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat: 🔍
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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

12/17/2020 CVE assigned
02/23/2021 +68 days Advisory disclosed
02/23/2021 +0 days VulDB entry created
03/04/2021 +9 days VulDB last update

Sourcesinfoedit

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2021-20220 (🔒)

Entryinfoedit

Created: 02/23/2021 09:06 PM
Updated: 03/04/2021 05:32 PM
Changes: (18) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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