HOMEVULNERABILITIESCVE-2017-11309
CRITICALPOC

CVE-2017-11309

CWE-119Published: November 10, 2017· Updated: Jun 17, 2026

9.6
CVSS v3.1

Official Description

Buffer overflow in the SoftConsole client in Avaya IP Office before 10.1.1 allows remote servers to execute arbitrary code via a long response.

NVD Source

Technical Analysis

CVE-2017-11309 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

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 9.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

A proof-of-concept (PoC) exploit exists for CVE-2017-11309. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

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

Affected Vendors & Products

avaya1 product(s)
ip office
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

All References (10)

Quick Facts

CVE IDCVE-2017-11309
CVSS Score9.6 / 10
SeverityCRITICAL
WeaknessCWE-119
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedNov 10, 2017

Related CVEs (CWE-119)

Recommended Actions

  • Apply vendor patches immediately
  • Monitor CVE-2017-11309 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.