CVE-2019-19945 Integer overflow in n/a
An attacker can crash the OpenWrt uhttpd web server by sending a crafted HTTP POST request with a negative Content-Length header.
- 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-2019-19945?
CVE-2019-19945 is a high-severity vulnerability in Openwrt Openwrt, published on 16 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
uhttpd in OpenWrt through 18.06.5 and 19.x through 19.07.0-rc2 has an integer signedness error. This leads to out-of-bounds access to a heap buffer and a subsequent crash. It can be triggered with an HTTP POST request to a CGI script, specifying both "Transfer-Encoding: chunked" and a large negative Content-Length value.
Which versions are affected by CVE-2019-19945?
It affects 1 product.
Products include Openwrt Openwrt.
How do I fix CVE-2019-19945?
No fix has been published for CVE-2019-19945 yet. Limit exposure of the affected software until one is available.
Is CVE-2019-19945 being exploited?
There is no known exploitation of CVE-2019-19945 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Openwrt Openwrt
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- CVE-2026-62948 Cross-site scripting in openwrt
- CVE-2026-30871 OpenWrt Project has Stack-based Buffer Overflow in DNS PTR Query
- CVE-2026-30872 OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup
- CVE-2021-28961 Command injection in n/a
Sources
Also known as GHSA-v643-533g-6c85.