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CVE-2016-6354

34
FAUCET Score

CVE-2016-6354 describes a critical heap-based buffer overflow vulnerability in the yy_get_next_buffer function of Flex versions prior to 2.6.1, impacting Debian Linux and Flex distributions. This flaw, with a CVSS score of 9.8 (CRITICAL), allows unauthenticated attackers to remotely trigger a denial of service or potentially execute arbitrary code with low attack complexity. Despite its high severity and EPSS score, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
<= 2.6.0CPE matchmatch criteria
cpe:2.3:a:westes:flex:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
8.77%
Probability of exploitation in next 30 days
EPSS Percentile
94.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0877 is in the 90th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: bogofilter
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: flex

Vendor Advisories (1)

redhatCVE-2016-6354Moderate

flex: buffer overflow in generated code (yy_get_next_buffer)

Jul 18, 2016

References

github.com / westes/flex/commit/a5cbe929ac3255d371e698f62dc256afe7006466
Patch
security.gentoo.org / glsa/201701-31
debian.org / security/2016/dsa-3653
Third Party Advisory
openwall.com / lists/oss-security/2016/07/18/8
Release NotesThird Party Advisory
openwall.com / lists/oss-security/2016/07/26/12
Release NotesThird Party Advisory