Security readout for executives and security teams
Plain-English summary
Cisco IP Phones running 11.7(1) have a web application buffer overflow. A remote unauthenticated attacker who can reach the phone web server could crash/reload the phone or execute code as root. Sources provided do not show active exploitation or a CVSS score.
Executive priority
Treat as high priority where affected phones are reachable beyond tightly controlled management networks. The business risk is both service disruption to voice communications and possible device compromise with root privileges.
Technical view
CVE-2016-1421 is a CWE-119 bounds-check failure in the Cisco IP Phone web application. The CVE states crafted HTTP input to the device web server can trigger root-level remote code execution or denial of service through phone reload.
Likely exposure
Exposure is most likely where Cisco IP Phones with software 11.7(1) have their web server reachable from user, VoIP, management, VPN, or internet-accessible networks.
Exploitation context
The provided sources support unauthenticated remote attack reachability against the phone web server. They do not provide evidence of known active exploitation, and CISA KEV status is false in the bundle.
Researcher notes
The bundle identifies Cisco IP Phones 11.7(1), CWE-119, unauthenticated HTTP reachability, root-level code execution, and DoS by reload. It does not include CVSS details, specific models beyond Cisco IP Phones, exploit-in-the-wild evidence, or patch version details.
Mitigation direction
- Check Cisco advisory cisco-sa-20160609-ipp for fixed software and vendor guidance.
- Identify and prioritize Cisco IP Phones running software version 11.7(1).
- Restrict access to phone web servers to trusted management networks only.
- Monitor phones for unexpected reloads or web-server access anomalies.
Validation and detection
- Inventory Cisco IP Phone models and software versions across voice networks.
- Confirm whether phone web servers are reachable from untrusted network segments.
- Review network controls around VoIP, VPN, and management access paths.
- Check change records for Cisco advisory remediation or compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-119: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2016-1421 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- 20160609 Cisco IP Phones Web Application Buffer Overflow VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
- https://www.tenable.com/security/research/tra-2020-24CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.