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CVE-2020-3161

Cisco — Cisco IP Phones Web Server Remote Code Execution and Denial-of-Service Vulnerability

Cisco · CWE-20 — Improper input validation · in CISA KEV since 2021-11-03

KEV since 2021 · listed over a yearCISA KEVActively Exploited
83

EVRS 83 of 100 Urgent

Patch This Cycle

Rank 524 of 2,960 tracked

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Why it scores 83

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.839.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

No fixed version identified yet

CISA required action

Affected versions

  • ip phone 8865 firmware10.3\(1\)es1411.0\(1\)11.0\(5\)sr1
  • ip phone 8851 firmware10.3\(1\)es1411.0\(1\)11.0\(5\)sr1
  • ip phone 7841 firmware11.0\(1\)
  • ip phone 7821 firmware11.0\(1\)
  • ip phone 8811 firmware10.3\(1\)es1411.0\(1\)11.0\(5\)sr1
  • ip phone 8861 firmware10.3\(1\)es1411.0\(1\)11.0\(5\)sr1
  • ip phone 8845 firmware10.3\(1\)es1411.0\(1\)11.0\(5\)sr1
  • ip phone 7861 firmware11.0\(1\)

+18 more affected products; see the full list at NVD.

Remediation

Apply updates per vendor instructions.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.839 (99.69th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-05-03 · KEV since 2021 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.8 (v3.0), assigned by cisco. Listed ENISA EUVD

Description

NVD

A vulnerability in the web server for Cisco IP Phones could allow an unauthenticated, remote attacker to execute code with root privileges or cause a reload of an affected IP phone, resulting in a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to the web server of a targeted device. A successful exploit could allow the attacker to remotely execute code with root privileges or cause a reload of an affected IP phone, resulting in a DoS condition.

What CISA says to do