HOMEVULNERABILITIESCVE-2015-2311
CRITICAL

CVE-2015-2311

CWE-191Published: August 9, 2017· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2015-2311 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

capnproto1 product(s)
capnproto
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://www.openwall.com/lists/oss-security/2015/03/17/3
ADVISORYhttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780566
ADVISORYhttps://github.com/capnproto/capnproto/blob/master/security-advisories/2015-03-02-1-c%2B%2B-integer-underflow.md
ADVISORYhttps://github.com/capnproto/capnproto/commit/26bcceda72372211063d62aab7e45665faa83633
ADVISORYhttp://www.openwall.com/lists/oss-security/2015/03/17/3
ADVISORYhttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780566
ADVISORYhttps://github.com/capnproto/capnproto/blob/master/security-advisories/2015-03-02-1-c%2B%2B-integer-underflow.md
ADVISORYhttps://github.com/capnproto/capnproto/commit/26bcceda72372211063d62aab7e45665faa83633

All References (8)

→
http://www.openwall.com/lists/oss-security/2015/03/17/3Mailing List · Third Party Advisory
→
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780566Mailing List · Third Party Advisory
→
https://github.com/capnproto/capnproto/blob/master/security-advisories/2015-03-02-1-c%2B%2B-integer-underflow.mdThird Party Advisory
→
https://github.com/capnproto/capnproto/commit/26bcceda72372211063d62aab7e45665faa83633Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2015/03/17/3Mailing List · Third Party Advisory
→
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=780566Mailing List · Third Party Advisory
→
https://github.com/capnproto/capnproto/blob/master/security-advisories/2015-03-02-1-c%2B%2B-integer-underflow.mdThird Party Advisory
→
https://github.com/capnproto/capnproto/commit/26bcceda72372211063d62aab7e45665faa83633Third Party Advisory

Quick Facts

CVE IDCVE-2015-2311
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-191
CISA KEVNo
Affected1 vendor(s)
PublishedAug 9, 2017

Related CVEs (CWE-191)

CVE-2007-0063
10.0
CVE-2019-14199
9.8
CVE-2019-14192
9.8
CVE-2016-10166
9.8
CVE-2015-9129
9.8
CVE-2018-21065
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2015-2311 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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