5.4
MEDIUM
CVE-2021-3866
Zulip GitHub Repository Stored Cross-Site Scripting Vulnerability
Description

Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.

INFO

Published Date :

Jan. 20, 2022, 11:15 a.m.

Last Modified :

Feb. 3, 2022, 2:20 p.m.

Remotely Exploitable :

Yes !

Impact Score :

2.7

Exploitability Score :

2.3
Affected Products

The following products are affected by CVE-2021-3866 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zulip zulip
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-3866.

URL Resource
https://blog.zulip.com/2022/01/19/cve-2021-3866/ Vendor Advisory
https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 Patch Third Party Advisory
https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2 Exploit Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3866 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-3866 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Feb. 03, 2022

    Action Type Old Value New Value
    Changed Reference Type https://blog.zulip.com/2022/01/19/cve-2021-3866/ No Types Assigned https://blog.zulip.com/2022/01/19/cve-2021-3866/ Vendor Advisory
  • CVE Modified by [email protected]

    Jan. 29, 2022

    Action Type Old Value New Value
    Changed Description Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip prior to and including 4.8. Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip more than and including 44f935695d452cc3fb16845a0c6af710438b153d and prior to 3eb2791c3e9695f7d37ffe84e0c2184fae665cb6.
  • CVE Modified by [email protected]

    Jan. 28, 2022

    Action Type Old Value New Value
    Added Reference https://blog.zulip.com/2022/01/19/cve-2021-3866/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Jan. 26, 2022

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
    Changed Reference Type https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 No Types Assigned https://github.com/zulip/zulip/commit/3eb2791c3e9695f7d37ffe84e0c2184fae665cb6 Patch, Third Party Advisory
    Changed Reference Type https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2 No Types Assigned https://huntr.dev/bounties/5f48dac5-e112-4b23-bbbf-cc00ba83bcf2 Exploit, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:zulip:zulip:*:*:*:*:*:*:*:* versions up to (including) 4.8
  • CVE Modified by [email protected]

    Jan. 21, 2022

    Action Type Old Value New Value
    Changed Description Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip prior to main. Cross-site Scripting (XSS) - Stored in GitHub repository zulip/zulip prior to and including 4.8.
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3866 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-3866 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.06 }} 0.00%

score

0.24459

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability