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CVE-2021-21439— Possible DoS attack using a special crafted URL in email body

Quick assessment

Affected
OTRS AG ((OTRS)) Community Edition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OTRS是德国 （OTRS）公司的一个应用软件。一个服务管理软件。 OTRS AG OTRS 中存在输入验证错误漏洞，该漏洞源于系统未对输入的数据进行正确的验证。攻击者在电子邮件的正文中放置专门设计的URL可导致高CPU使用率和低服务质量，或者在极端情况下导致系统停止。以下产品及型号受到影响：OTRS AG ((OTRS)) Community Edition 6.0。X 版本 6.0.1及以上版本。Otrs ag Otrs 7.0。X版本7.0.26和以前的版本;8.0。X版本8.0.13和以前的版本。

CVSS 6.5 · Medium EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-21439

Vulnerability Information
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Vulnerability Title
Possible DoS attack using a special crafted URL in email body
Source: CVE Program / CVE List V5
Vulnerability Description
DoS attack can be performed when an email contains specially designed URL in the body. It can lead to the high CPU usage and cause low quality of service, or in extreme case bring the system to a halt. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.26 and prior versions; 8.0.x version 8.0.13 and prior versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
OTRS AG OTRS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OTRS是德国 （OTRS）公司的一个应用软件。一个服务管理软件。 OTRS AG OTRS 中存在输入验证错误漏洞，该漏洞源于系统未对输入的数据进行正确的验证。攻击者在电子邮件的正文中放置专门设计的URL可导致高CPU使用率和低服务质量，或者在极端情况下导致系统停止。以下产品及型号受到影响：OTRS AG ((OTRS)) Community Edition 6.0。X 版本 6.0.1及以上版本。Otrs ag Otrs 7.0。X版本7.0.26和以前的版本;8.0。X版本8.0.13和以前的版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OTRS AG ((OTRS)) Community Edition 6.0.1 ~ 6.0.x* -
OTRS AG OTRS 7.0.x ~ 7.0.26 -

II. Public POCs for CVE-2021-21439

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III. Intelligence Information for CVE-2021-21439

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Mailing List Discussions for CVE-2021-21439 (1)

Other References for CVE-2021-21439 (1)

IV. Related Vulnerabilities

Same product: ((OTRS)) Community Edition
Same vendor: OTRS AG
Same weakness: CWE-754

V. Comments for CVE-2021-21439

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