CVE-2024-4227: Genivia gSOAP XML Parsing DoS Vulnerability

CVE-2024-4227 Overview

CVE-2024-4227 affects Genivia gSOAP, a widely deployed C/C++ toolkit for building SOAP and XML web services. When configured in a specific manner, the XML parser exhibits inefficient algorithmic behavior when processing documents containing duplicate ID attributes. An unauthenticated remote attacker can submit a crafted XML payload that forces the parser into a high CPU load condition, resulting in denial of service. The flaw is classified under [CWE-834] (Excessive Iteration) and impacts availability only, with no compromise of confidentiality or integrity.

Critical Impact
Unauthenticated remote attackers can exhaust CPU resources on gSOAP-based services by submitting XML with duplicate ID attributes, rendering web services unavailable.

Affected Products

Genivia gSOAP (specific configurations parsing XML with ID attributes)
Applications and services built on the gSOAP toolkit
C/C++ SOAP services generated using gSOAP code generation

Discovery Timeline

2025-01-15 - CVE-2024-4227 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-4227

Vulnerability Analysis

The vulnerability resides in the gSOAP XML parsing logic responsible for resolving element identifiers. When the parser encounters XML documents containing repeated ID attribute values, it performs excessive iteration while attempting to resolve or validate the duplicates. The algorithmic complexity scales poorly with the number of duplicate identifiers, allowing a small payload to generate disproportionate processing cost. Since gSOAP services are commonly exposed over HTTP, the attack surface includes any network-reachable SOAP endpoint built on the affected toolkit. The impact is limited to availability, but unauthenticated remote exploitation makes the issue practical to weaponize against production web services.

Root Cause

The root cause is inefficient handling of duplicate ID attributes during XML parsing, mapped to [CWE-834] Excessive Iteration. The parser does not enforce an upper bound on the work performed when reconciling repeated identifiers, allowing input-driven amplification of CPU consumption.

Attack Vector

An attacker sends an HTTP request containing an XML or SOAP body populated with numerous elements sharing duplicate ID attribute values. The gSOAP parser iterates over these duplicates inefficiently, saturating one or more CPU cores. Sustained or repeated requests amplify the effect, exhausting compute capacity on the target host and degrading or halting service availability. No authentication or user interaction is required. Refer to the Genivia Security Advisory on C++11 and the SourceForge gSOAP Change Log for technical details on affected configurations.

Detection Methods for CVE-2024-4227

Indicators of Compromise

Sustained high CPU utilization on processes hosting gSOAP-based SOAP/XML services without proportional request volume
Inbound HTTP requests carrying XML or SOAP payloads with numerous elements sharing identical ID attribute values
Slow or unresponsive SOAP endpoints coinciding with bursts of XML POST requests from a small set of source IPs

Detection Strategies

Inspect XML/SOAP request bodies at the web application firewall (WAF) or API gateway for repeated ID attribute values and reject payloads exceeding a defined threshold
Baseline CPU usage of gSOAP service processes and alert on sustained spikes that do not correlate with request rate
Correlate process-level CPU exhaustion telemetry with network logs of inbound SOAP traffic to identify candidate attack sources

Monitoring Recommendations

Forward web server, reverse proxy, and application logs to a centralized analytics platform for correlation of payload anomalies with resource metrics
Monitor per-endpoint request latency and timeouts for SOAP services to detect early signs of CPU saturation
Track repeat offenders by source IP submitting oversized or structurally anomalous XML payloads

How to Mitigate CVE-2024-4227

Immediate Actions Required

Upgrade Genivia gSOAP to the latest version per the Genivia Security Advisory on C++11
Review gSOAP build and runtime configuration to confirm whether the vulnerable code generation option is in use
Place gSOAP-based services behind a WAF or API gateway that enforces XML payload size and structure limits

Patch Information

Genivia has published guidance and updated releases addressing the parser behavior. Consult the SourceForge gSOAP Change Log for the specific fix and the Genivia Security Advisory on C++11 for upgrade recommendations when C++11 code generation is enabled. Rebuild and redeploy any binaries linked against vulnerable gSOAP versions.

Workarounds

Enforce maximum XML document size and maximum element/attribute counts at the gateway before requests reach the gSOAP parser
Apply rate limiting and per-source connection throttling on SOAP endpoints to reduce amplification potential
Restrict network exposure of internal SOAP services using network ACLs or VPN-only access where public access is not required

bash

# Example: nginx limits to reduce DoS amplification against SOAP endpoints
client_max_body_size 256k;
limit_req_zone $binary_remote_addr zone=soap:10m rate=10r/s;
location /soap/ {
    limit_req zone=soap burst=20 nodelay;
    proxy_pass http://gsoap_backend;
}