CVE-2016-6354

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Summary

CVECVE-2016-6354
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-09-21 14:25:20 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionHeap-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.

Risk And Classification

Primary CVSS: v3.0 9.8 CRITICAL from [email protected]

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

EPSS: 0.377150000 probability, percentile 0.972240000 (date 2026-05-06)

Problem Types: CWE-119 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary9.8CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:L/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 8.0 All All All
Application Westes Flex All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Debian -- Security Information -- DSA-3653-1 flex af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
oss-security - Re: CVE request: flex: Buffer overflow in generated code (yy_get_next_buffer) af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Release Notes, Third Party Advisory
Fixed incorrect integer type · westes/flex@a5cbe92 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch
oss-security - CVE request: flex: Buffer overflow in generated code (yy_get_next_buffer) af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Release Notes, Third Party Advisory
flex: Potential insecure code generation (GLSA 201701-31) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 710287 Gentoo Linux Mozilla Firefox Multiple Vulnerabilities (GLSA 201802-03)
  • 710520 Gentoo Linux flex Potential insecure code generation Vulnerability (GLSA 201701-31)
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