CVE-2016-6354 Memory corruption in n/a

What is CVE-2016-6354?

CVE-2016-6354 is a critical memory corruption vulnerability in Debian Debian Linux, published on 21 Sep 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Heap-based buffer overflow in the yy_get_next_buffer function in Flex before 2.6.1 might allow context-dependent attackers to cause a denial of service or possibly execute arbitrary code via vectors involving num_to_read.

Weakness: CWE-119

Which versions are affected by CVE-2016-6354?

It affects 2 products.

Products include Debian Debian Linux, Westes Flex.

How do I fix CVE-2016-6354?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2016-6354 being exploited?

There is no known exploitation of CVE-2016-6354 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2016-6354, DEBIAN-CVE-2016-6354, DSA-3653-1, DSA-3653-2, GHSA-4c6r-jqvh-f3hm, MGASA-2016-0396 and 1 more.