CVE-2015-3249

The HTTP/2 experimental feature in Apache Traffic Server 5.3.x before 5.3.1 allows remote...

9.8 CriticalFix available

The HTTP/2 experimental feature in Apache Traffic Server 5.3.x before 5.3.1 allows remote attackers to cause a denial of service (out-of-bounds access and daemon crash) or possibly execute arbitrary code via vectors related to the (1) frame_handlers array or (2) set_dynamic_table_size function.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

5.44%Up 1.7 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2015-3249
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2015-3249
Updated: 2026-11-02

EUVDEUVD-2015-3304 No score

Record: EUVD-2015-3304
Updated: 2026-11-03

GitHub AdvisoriesGHSA-465p-v3ff-mc33 9.8

The HTTP/2 experimental feature in Apache Traffic Server 5.3.x before 5.3.1 allows remote...

Record: GHSA-465p-v3ff-mc33
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-02

OSV 9.8

Record: CVE-2015-3249
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2015-3249 9.8

Record: DEBIAN-CVE-2015-3249
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2015-3249 9.8

Record: UBUNTU-CVE-2015-3249
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

apache traffic server

Affected packages

Affected packages
Package	Affected	Fixed
`trafficserver` Debian:12	before 5.3.1-1	5.3.1-1
`trafficserver` Ubuntu:16.04:LTS	All versions, plus listed versions 5.3.0-2ubuntu15.3.0-2ubuntu2	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-3249 is a critical vulnerability (CVSS 9.8) in Apache Traffic Server, published October 30, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.44%, the 92nd percentile. Fixed in trafficserver 5.3.1-1.