CVE-2024-20376 [High] | Out-of-bounds Write in Video Phone 8875 Firmware

A vulnerability in the web-based management interface of Cisco IP Phone firmware could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a DoS condition. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.61%	0.87%	+0.26%
2	2026-03-31	0.47%	0.61%	+0.14%
3	2026-01-06	—	0.47%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.61%

0.87%

+0.26%

2026-03-31

0.47%

0.61%

+0.14%

2026-01-06

—

0.47%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

Affected software / configurations for CVE-2024-20376

References for CVE-2024-20376

URL	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-multi-vulns-cXAhCvS	Vendor Advisory

URL

CVE-2024-20376

Exploit prediction scoring system (EPSS) score for CVE-2024-20376

Common vulnerability scoring system (CVSS) metrics for CVE-2024-20376

Weakness enumeration for CVE-2024-20376

Affected software / configurations for CVE-2024-20376

References for CVE-2024-20376

Vendor	Product	Version	Raw CPE
cisco	video_phone_8875_firmware	< 2.3.1.0101	cpe:2.3:o:cisco:video_phone_8875_firmware::::::::
cisco	ip_phone_6821_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_6821_with_multiplatform_firmware::::::::
cisco	ip_phone_6841_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_6841_with_multiplatform_firmware::::::::
cisco	ip_phone_6851_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_6851_with_multiplatform_firmware::::::::
cisco	ip_phone_6861_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_6861_with_multiplatform_firmware::::::::
cisco	ip_phone_6871_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_6871_with_multiplatform_firmware::::::::
cisco	ip_phone_7811_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_7811_with_multiplatform_firmware::::::::
cisco	ip_phone_7821_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_7821_with_multiplatform_firmware::::::::
cisco	ip_phone_7832_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_7832_with_multiplatform_firmware::::::::
cisco	ip_phone_7841_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_7841_with_multiplatform_firmware::::::::
cisco	ip_phone_7861_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_7861_with_multiplatform_firmware::::::::
cisco	ip_phone_8811_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8811_with_multiplatform_firmware::::::::
cisco	ip_phone_8832_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8832_with_multiplatform_firmware::::::::
cisco	ip_phone_8841_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8841_with_multiplatform_firmware::::::::
cisco	ip_phone_8845_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8845_with_multiplatform_firmware::::::::
cisco	ip_phone_8851_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8851_with_multiplatform_firmware::::::::
cisco	ip_phone_8861_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8861_with_multiplatform_firmware::::::::
cisco	ip_phone_8865_with_multiplatform_firmware	<= 12.0.4	cpe:2.3:o:cisco:ip_phone_8865_with_multiplatform_firmware::::::::