Unrated severityNVD Advisory· Published Dec 15, 2015· Updated Jun 17, 2026

CVE-2015-6403

Description

The TFTP implementation on Cisco Small Business SPA30x, SPA50x, SPA51x phones 7.5.7 improperly validates firmware-image file integrity, which allows local users to load a Trojan horse image by leveraging shell access, aka Bug ID CSCut67400.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Cisco Systems, Inc./Spa300 Firmware2 versions
cpe:2.3:o:cisco:spa300_firmware:7.5.7:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:cisco:spa300_firmware:7.5.7:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:spa500_firmware:7.5.7:*:*:*:*:*:*:*
Cisco Systems, Inc./Small Business SPA30x/SPA50x/SPA51xllm-create
Range: =7.5.7

Patches

Vulnerability mechanics

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151209-ippnvdVendor Advisory
www.securityfocus.com/bid/78739nvd
www.securitytracker.com/id/1034376nvd

News mentions

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