CVE intelligence and bounded remediation

CVE-2019-1635 — Cisco Ip Conference Phone 7832 Firmware security vulnerability

High CVSS 7.8

A vulnerability in the call-handling functionality of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to incomplete error handling when XML data within a SIP packet is parsed. An attacker could exploit this vulnerability by sending a SIP packet that contains a malicious XML payload to an affected phone. A successful exploit could allow the attacker to cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition.

Severity
High
CVSS
7.8 (2.0)
Published
2019-05-03
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-399, CWE-755

Affected products

  • cisco / ip_conference_phone_7832_firmware / 9.3(4)sr3
  • cisco / ip_conference_phone_7832_firmware / 10.3(1)sr4b
  • cisco / ip_conference_phone_7832_firmware / 11.0(4)sr2
  • cisco / ip_conference_phone_7832_firmware / 12.1(1)sr1
  • cisco / ip_conference_phone_8832_firmware / 9.3(4)sr3
  • cisco / ip_conference_phone_8832_firmware / 10.3(1)sr4b

Showing 6 representative product identities from 64 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

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