CVE-2015-2311

Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow...

9.8 CriticalFix available

Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow remote peers to cause a denial of service or possibly obtain sensitive information from memory or execute arbitrary code via a crafted message.

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

2.54%Up 0.1 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2015-2311
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-191
Updated: 2026-11-02

CVE List No score

Record: CVE-2015-2311
Updated: 2026-11-02

EUVDEUVD-2015-2406 No score

Record: EUVD-2015-2406
Updated: 2026-11-03

GitHub AdvisoriesGHSA-w3xw-rq95-8jcw 9.8

Integer underflow in Sandstorm Cap'n Proto before 0.4.1.1 and 0.5.x before 0.5.1.1 might allow...

Record: GHSA-w3xw-rq95-8jcw
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-191
Updated: 2026-11-02

OSV 9.8

Record: CVE-2015-2311
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-2015-2311 9.8

Record: DEBIAN-CVE-2015-2311
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-2015-2311 9.8

Record: UBUNTU-CVE-2015-2311
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

capnproto

Affected packages

Affected packages
Package	Affected	Fixed
`capnproto` Debian:12	before 0.4.1-3	0.4.1-3
`capnproto` Debian:13	before 0.4.1-3	0.4.1-3
`capnproto` Debian:14	before 0.4.1-3	0.4.1-3
`capnproto` Ubuntu:14.04:LTS	before 0.4.0-1ubuntu2.1, plus listed versions 0.2.1-10.4.0~git20131030+e7d2778-0ubuntu10.4.0-1ubuntu10.4.0-1ubuntu2	0.4.0-1ubuntu2.1

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-2015-2311 is a critical vulnerability (CVSS 9.8) in Capnproto, published August 9, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.54%, the 85th percentile. Fixed in capnproto 0.4.1-3.

References

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