CVE-2021-3649 Inefficient Regular Expression Complexity in chatwoot/chatwoot
Attackers can cause denial of service in Chatwoot by exploiting inefficient regular expression complexity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-3649?
CVE-2021-3649 is a high-severity denial of service vulnerability in chatwoot/chatwoot, published on 16 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
chatwoot is vulnerable to Inefficient Regular Expression Complexity
Weakness: CWE-1333
Which versions are affected by CVE-2021-3649?
It affects 1 product.
Products include Chatwoot Chatwoot.
How do I fix CVE-2021-3649?
No fix has been published for CVE-2021-3649 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-3649 being exploited?
There is no known exploitation of CVE-2021-3649 in the wild and no public exploit code.
Other vulnerabilities in chatwoot/chatwoot
- CVE-2022-3741 Improper Restriction of Excessive Authentication Attempts in chatwoot/chatwoot
- CVE-2025-21628 Chatwoot has a Blind SQL-injection in Conversation and Contacts filters
- CVE-2022-0542 Cross-site Scripting (XSS) - DOM in chatwoot/chatwoot
- CVE-2022-1022 Cross-site Scripting (XSS) - Stored in chatwoot/chatwoot
- CVE-2021-3742 Server-Side Request Forgery (SSRF) in chatwoot/chatwoot
Sources
Also known as GHSA-964r-mpxx-74p7.