CVE-2012-2374 Tornado CRLF injection vulnerability
Remote attackers can inject arbitrary HTTP headers and conduct response splitting attacks via crafted input in the Tornado web framework.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2012-2374?
CVE-2012-2374 is a medium-severity vulnerability in n/a, published on 23 May 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
CRLF injection vulnerability in the tornado.web.RequestHandler.set_header function in Tornado before 2.2.1 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via crafted input.
Weakness: CWE-20
Which versions are affected by CVE-2012-2374?
3 open source packages ship an affected version, including tornado. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
tornado PyPI | All versions | 2.2.1 |
tornado PyPI | All versions | 2.2.1 |
tornado PyPI | All versions | 2.2.1 |
Products include Tornadoweb Tornado.
How do I fix CVE-2012-2374?
Upgrade tornado to 2.2.1 or later.
Is CVE-2012-2374 being exploited?
There is no known exploitation of CVE-2012-2374 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2026-31958 Tornado has a DoS due to too many multipart parts
- CVE-2025-67725 Tornado is Vulnerable to Quadratic DoS via Repeated Header Coalescing
- CVE-2025-67726 Tornado is Vulnerable to Quadratic DoS via Crafted Multipart Parameters
- CVE-2024-52804 Tornado has HTTP cookie parsing DoS vulnerability
- CVE-2026-35536 Tornado has incomplete validation of cookie attributes
Sources
Also known as DEBIAN-CVE-2012-2374, GHSA-f7fv-v9rh-prvc, PYSEC-2012-5.