SysAid On-Prem Unauthenticated XML External Entity (XXE) Vulnerability (CVE-2025-2775) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSysAid On-Prem versions 23.3.40 and below
Unauthenticated remote attackers can read arbitrary system files and perform administrator account takeover, leading to full system compromise.
Immediately upgrade SysAid On-Prem to version 24.4.60 or higher, and restrict external access to the Checkin endpoint prior to patching.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Refer to the official SysAid release notes and immediately upgrade your installation to version 24.4.60 or higher. Below is an example procedure to stop the service and apply the update on a Linux host.
# Stop the SysAid service
sudo systemctl stop sysaid
# Download and execute the secure version installer
# Example: Downloading the patch installer
wget https://documentation.sysaid.com/downloads/sysaid-setup-24.4.60.run
chmod +x sysaid-setup-24.4.60.run
sudo ./sysaid-setup-24.4.60.run --mode unattended
# Restart the service and verify status
sudo systemctl start sysaid
sudo systemctl status sysaid2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, use a reverse proxy (such as Nginx) or a Web Application Firewall (WAF) to block external access to the vulnerable Checkin endpoint or filter out malicious XML payloads.
# Nginx configuration snippet to restrict access and block XXE payloads
server {
listen 80;
server_name sysaid.local;
# Restrict access to the Checkin endpoint
location /Checkin {
allow 10.0.0.0/8; # Allow trusted internal network only
deny all;
}
# Block requests containing XML external entity declarations
if ($request_body ~* '<!ENTITY' ) {
return 403;
}
}3. Log Audit & IoC Verification Commands
Inspect SysAid application and access logs for suspicious XML payloads or unusual requests targeting the Checkin endpoint.
# Search for 'Checkin' requests and potential XXE keywords in SysAid logs
grep -ri 'Checkin' /var/log/sysaid/ 2>/dev/null | grep -i 'ENTITY'
# Verify the currently installed SysAid version\ cat /usr/share/sysaid/root/WEB-INF/conf/version.txt 2>/dev/null || echo 'Version file not found'Block Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-2775) is an XML External Entity (XXE, CWE-611) flaw residing in the Checkin processing functionality of SysAid On-Prem. The root cause is the application's failure to properly restrict or disable external entity resolution when parsing XML data supplied by users. This allows unauthenticated remote attackers to submit specially crafted XML payloads to the server.
2. Exploitation Mechanics & Attack Scenario
An attacker sends a malicious HTTP request containing an XML payload with external entity definitions to the SysAid Checkin endpoint. When the XML parser processes this request, it attempts to resolve the defined external URI (such as local system files or an attacker-controlled external server). The parser then includes the resolved content in the response or exfiltrates it via out-of-band channels. This enables the attacker to extract sensitive configuration files and credentials, ultimately leading to administrator account takeover and potential remote code execution (RCE).
3. Infrastructure & Business Impact
This vulnerability is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. Successful exploitation allows complete compromise of the SysAid server, which often holds critical IT asset and helpdesk data. This can serve as an entry point for lateral movement within the corporate network, resulting in data exfiltration, ransomware deployment, and severe operational disruption.
Official Vendor Advisories & References
SysAid On-Prem versions <= 23.3.40 are vulnerable to an unauthenticated XML External Entity (XXE) vulnerability in the Checkin processing functionality, allowing for administrator account takeover and file read primitives.
Frequently Asked SecOps Questions (CVE-2025-2775)
FAQQ1. How critical is CVE-2025-2775 and is it actively exploited in the wild?
CVE-2025-2775 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 43.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-2775?
Primary impacted vendors include sysaid across sysaid on-prem. Scope summary: All SysAid On-Prem versions up to and including 23.3.40
Q3. What temporary mitigations or workarounds exist for CVE-2025-2775 before patching?
[Mitigation] Immediately upgrade SysAid On-Prem to version 24.4.60 or higher, and restrict external access to the Checkin endpoint prior to patching. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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