CVE-2024-20483: Cisco IOS XR PON Controller RCE Vulnerability

CVE-2024-20483 Overview

Cisco disclosed multiple command injection vulnerabilities in the Routed Passive Optical Network (PON) Controller Software, tracked collectively as CVE-2024-20483. The PON Controller runs as a Docker container on hardware supported by Cisco IOS XR Software. An authenticated remote attacker with Administrator-level privileges on the PON Manager, or with direct access to the PON Manager MongoDB instance, can execute arbitrary commands as root on the PON Controller container. The flaws stem from insufficient validation of arguments passed to specific configuration commands [CWE-78].

Critical Impact
Successful exploitation grants root-level arbitrary command execution on the PON Controller container, compromising the integrity of the optical network infrastructure.

Affected Products

Cisco IOS XR Software 24.1.1 and 24.1.2
Cisco IOS XR Software 24.2.1 and 24.2.11
Cisco IOS XR Software 24.3.1 (Routed PON Controller container)

Discovery Timeline

2024-09-11 - CVE-2024-20483 published to NVD alongside the Cisco Security Advisory
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-20483

Vulnerability Analysis

The Routed PON Controller is a containerized workload deployed on Cisco IOS XR hardware to manage passive optical network elements. Multiple configuration commands accept operator-supplied arguments that are relayed to the underlying shell without adequate sanitization. An attacker who authenticates to the PON Manager as Administrator, or who can reach the backing MongoDB instance directly, can inject shell metacharacters into these arguments. The injected payload is executed within the PON Controller container as the root user.

Because the PON Controller manages provisioning and telemetry for optical line terminals, arbitrary command execution enables tampering with subscriber-facing services, exfiltration of configuration state, and establishment of persistence inside the container runtime on IOS XR hardware.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-78]. Configuration handlers pass user-controlled strings into command execution contexts without argument escaping, allow-listing, or parameterized invocation. This maps directly to the classic command injection pattern.

Attack Vector

Exploitation requires network reachability to the PON Manager and either Administrator credentials on the PON Manager or direct network access to the PON Manager MongoDB database. An attacker crafts a malicious payload embedded in the argument of an affected configuration command. When the PON Controller processes the record, the injected shell command executes as root inside the container.

Cisco has not disclosed the exact vulnerable command names. Refer to the Cisco Security Advisory for authoritative technical detail. No public proof-of-concept exploit is available at time of writing.

Detection Methods for CVE-2024-20483

Indicators of Compromise

Unexpected child processes spawned by the PON Controller container, especially shells (sh, bash) invoked from configuration handler processes.
MongoDB write operations to PON Manager collections containing shell metacharacters such as ;, |, `, $(, or newline sequences in configuration fields.
New or modified files under container-writable paths that were not introduced by a documented Cisco software update.

Detection Strategies

Enable and centralize command auditing on IOS XR and forward PON Manager application logs to a SIEM for correlation of administrative sessions with configuration writes.
Alert on any authentication to MongoDB from source addresses outside the documented management plane.
Baseline the process tree of the PON Controller container and alert on deviations, particularly interpreter execution originating from configuration workers.

Monitoring Recommendations

Continuously monitor PON Manager Administrator account activity, including credential resets and privilege changes.
Track network flows to the MongoDB instance and alert on non-management-plane connections.
Review Cisco IOS XR system logs for container restarts or crashes coincident with configuration changes.

How to Mitigate CVE-2024-20483

Immediate Actions Required

Upgrade Cisco IOS XR and the Routed PON Controller Software to the fixed release identified in the Cisco Security Advisory.
Restrict PON Manager Administrator accounts to named individuals and enforce strong, unique credentials with multi-factor authentication where supported.
Segment the PON Manager MongoDB instance so that only the PON Manager application can reach it, blocking direct database access from operator networks.

Patch Information

Cisco has released fixed software addressing CVE-2024-20483. Consult the Cisco Security Advisory for the specific fixed versions applicable to your deployed IOS XR release train and PON Controller image. There are no documented workarounds that fully address the vulnerabilities; patching is the required remediation.

Workarounds

No official workarounds are available. Cisco recommends upgrading to a fixed software release.
As a compensating control, restrict management-plane access to the PON Manager and its MongoDB backend using access control lists and network segmentation until patching is complete.
Rotate PON Manager Administrator credentials and any MongoDB credentials after patching to remove exposure from potentially compromised accounts.

bash

# Example: restrict MongoDB exposure with an iptables allow-list on the PON Manager host
# Replace 10.10.20.0/24 with the authorized management subnet.
iptables -A INPUT -p tcp --dport 27017 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 27017 -j DROP