CVE-2015-4226 — The packet-storing feature on Cisco 9900 phones with firmware 9.3(2) does not properly support the RTP protocol, which allows remote attackers to cause a denial of service (device hang) by sending malformed RTP packets after a call is answered, aka Bug ID CSCur39976

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HIGH

The packet-storing feature on Cisco 9900 phones with firmware 9.3(2) does not properly support the RTP protocol, which allows remote attackers to cause a denial of service (device hang) by sending malformed RTP packets after a call is answered, aka Bug ID CSCur39976

Published Jun 30, 2015

7.1

HIGH

CVSS 2.0

EPSS 2.77%

Description

The packet-storing feature on Cisco 9900 phones with firmware 9.3(2) does not properly support the RTP protocol, which allows remote attackers to cause a denial of service (device hang) by sending malformed RTP packets after a call is answered, aka Bug ID CSCur39976.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.77% 0.02774

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02774

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.77% (0.02774)	85.85th	v5 (v2026.06.15)
Jun 15, 2026	2.77% (0.02774)	84.42th	v5 (v2026.06.15)
Mar 17, 2025	1.22% (0.01223)	77.73th	v4 (v2025.03.14)
Dec 12, 2024	0.26% (0.00259)	66.15th	v3 (v2023.03.01)
Feb 8, 2024	0.26% (0.00259)	64.68th	v3 (v2023.03.01)
Mar 7, 2023	0.26% (0.00259)	61.87th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Oct 18, 2022	1.14% (0.01136)	58.28th	v2 (v2022.01.01)
Apr 1, 2022	1.14% (0.01136)	56.27th	v2 (v2022.01.01)
Feb 4, 2022	1.14% (0.01136)	34.23th	v2 (v2022.01.01)

Weaknesses (1)

CWE-399

References (3)

http://tools.cisco.com/security/center/viewAlert.x?alertId=39554
vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/75471
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1032748
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry

Link	Providers	Tags
http://tools.cisco.com/security/center/viewAlert.x?alertId=39554		vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/75471		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1032748		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Jun 30, 2015

Updated Aug 6, 2024

Reserved Jun 4, 2015

Link CVE-2015-4226

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-4226

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-4226