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CVE-2015-6391

20
FAUCET Score

CVE-2015-6391 describes a denial-of-service vulnerability affecting Cisco Unified SIP 3905 phones. Remote attackers can exploit this by sending a high volume of network traffic, leading to resource exhaustion and loss of phone functionality. With a CVSS score of 7.8 (High), this vulnerability is easily exploitable over the network with no authentication required, resulting in complete loss of availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
8.1\(1b\)CPE matchmatch criteria
cpe:2.3:o:cisco:unified_sip_phone_3900_firmware:8.1\(1b\):*:*:*:*:*:*:*
8.1\(2\)CPE matchmatch criteria
cpe:2.3:o:cisco:unified_sip_phone_3900_firmware:8.1\(2\):*:*:*:*:*:*:*
8.1\(2\)sr1CPE matchmatch criteria
cpe:2.3:o:cisco:unified_sip_phone_3900_firmware:8.1\(2\)sr1:*:*:*:*:*:*:*
8.1\(3\)CPE matchmatch criteria
cpe:2.3:o:cisco:unified_sip_phone_3900_firmware:8.1\(3\):*:*:*:*:*:*:*
8.1\(4\)CPE matchmatch criteria
cpe:2.3:o:cisco:unified_sip_phone_3900_firmware:8.1\(4\):*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.91%
Probability of exploitation in next 30 days
EPSS Percentile
77.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0191 is in the 61st percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20151202-sip
Vendor Advisory
securitytracker.com / id/1034285