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Permalink CVE-2026-20281
7.5 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): None (N)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): None (N)
  • Modified Availability (MA): High (H)
created 2 weeks ago Activity log
  • Created & dismissed (no matching packages found) suggestion 2 weeks ago
Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability

A vulnerability in Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 that are running Cisco Session Initiation Protocol (SIP) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management when an affected device processes HTTP packets. An attacker could exploit this vulnerability by sending a continuous stream of crafted HTTP packets to the device. A successful exploit could allow the attacker to cause the affected device to continuously consume memory, resulting in a DoS condition. A manual reboot of the device is required to recover from this condition. Note: For this vulnerability to be exploitable, the phone must be registered to Cisco Unified Communications Manager (Unified CM) and have Web Access enabled. Web Access is disabled by default.

Affected products

Cisco Session Initiation Protocol (SIP) Software
  • ==11.0(3)
  • ==10.3(1)SR5
  • ==12.7(1)SR1
  • ==12.1(1)SR1
  • ==11.0(0.7) MPP
  • ==14.0(1)
  • ==14.2(1)SR2
  • ==11.0(2)SR1
  • ==12.8(1)
  • ==11.0(3)SR3
  • ==11.0(3)SR2
  • ==14.1(1)SR1
  • ==4.1(1)
  • ==12.8(1)SR2
  • ==14.1(1)
  • ==11.0(5)SR1
  • ==10.3(1)SR3
  • ==14.3(1)SR2
  • ==14.2(1)
  • ==9.3(3)
  • ==14.2(1)SR3
  • ==11.0(6)SR6
  • ==14.2(1)SR1
  • ==10.2(2)
  • ==14.3(1)SR1
  • ==4.1(1)SR1
  • ==9.3(4)SR3 3rd Party
  • ==14.0(1)SR1
  • ==14.2(1)SR4
  • ==11.0(3)SR4
  • ==11.0(3)SR6
  • ==14.1(1)SR3
  • ==11.7(1)
  • ==10.3(1)
  • ==12.1(1)
  • ==2.0(1)
  • ==11.0(4)SR3
  • ==11.0(2)
  • ==10.3(1)SR2
  • ==10.4(1)SR2 3rd Party
  • ==11-0-1MSR1-1
  • ==3.0(1)
  • ==3.1(1)SR1
  • ==12.5(1)SR2
  • ==10.3(1.11) 3rd Party
  • ==3.1(1)
  • ==2.1(1)
  • ==12.0(1)
  • ==11.0(4)SR1
  • ==10.3(2)
  • ==12.8(1)SR1
  • ==3.2(1)
  • ==2.3(1)
  • ==14.4(1)
  • ==12.0(1)SR2
  • ==11.0(6)SR7
  • ==12.5(1)SR3
  • ==11.0(1)
  • ==3.5(1)SR1
  • ==10.1(1.9)
  • ==12.6(1)
  • ==3.6(1)
  • ==14.0(1)SR2
  • ==14.3(1)SR3
  • ==4.0(1)
  • ==11.0(6)SR1
  • ==11.0(4)
  • ==2.3(1)SR1
  • ==11.0(6)
  • ==3.5(1)
  • ==12.5(1)SR1
  • ==10.3(1)SR4b
  • ==10.2(1)SR1
  • ==10.3(1)SR6
  • ==11.0(5)SR2
  • ==9.3(4) 3rd Party
  • ==12.5(1)
  • ==12.7(1)
  • ==14.3(1)
  • ==10.4(1) 3rd Party
  • ==10.2(1)
  • ==11.0(6)SR5
  • ==10.1(1)SR1
  • ==11.5(1)SR1
  • ==14.4(1)SR1
  • ==10.1(1)SR2
  • ==11.0(3)SR1
  • ==3.4(1)
  • ==10.3(1.9) 3rd Party
  • ==9.3(4)SR2 3rd Party
  • ==11.0(6)SR2
  • ==2.2(1)
  • ==14.1(1)SR2
  • ==11.5(1)
  • ==11.0(4)SR2
  • ==10.3(1)SR1
  • ==11.0(5)SR3
  • ==11.0(3)SR5
  • ==3.3(1)
  • ==11.0(2)SR2
  • ==10.3(1)SR7
  • ==10.3(1)SR4
  • ==12.6(1)SR1
  • ==9.3(4)SR1 3rd Party
  • ==11.0(6)SR4
  • ==14.0(1)SR3
  • ==11.0(5)
  • ==12.0(1)SR1
  • ==14.4(1)SR2
  • ==12.0(1)SR3