CVE-2020-35684 Memory corruption in n/a
Attackers can trigger out-of-bounds reads or writes in TCP packet parsing by manipulating IP payload size fields, potentially causing crashes or information disclosure.
- 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-2020-35684?
CVE-2020-35684 is a high-severity memory corruption vulnerability in n/a, published on 19 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in HCC Nichestack 3.0. The code that parses TCP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the length of the TCP payload within the TCP checksum computation function. When the IP payload size is set to be smaller than the size of the IP header, the TCP checksum computation function may read out of bounds (a low-impact write-out-of-bounds is also possible).
Weakness: CWE-20
Which versions are affected by CVE-2020-35684?
It affects 3 products.
Products include Hcc-Embedded Nichestack, Siemens Sentron 3wa Com190 Firmware, Siemens Sentron 3wl Com35 Firmware.
How do I fix CVE-2020-35684?
No fix has been published for CVE-2020-35684 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-35684 being exploited?
There is no known exploitation of CVE-2020-35684 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-748v-rhfv-4hm6.