CVE-2025-0500 – This CVE describes a man-in-the-middle vulnerab... (How to Fix)

Q: What is the severity of CVE-2025-0500?

CVE-2025-0500 has a CVSS score of 7.5 (HIGH). This CVE describes a man-in-the-middle vulnerability in Amazon's remote desktop clients (WorkSpaces, AppStream 2.0, DCV) that could allow attackers to intercept and potentially access remote sessions. The vulnerability affects users of these AWS services when using the native client applications. Attackers positioned between clients and AWS infrastructure could exploit insufficient certificate validation.

📋 TL;DR

This CVE describes a man-in-the-middle vulnerability in Amazon's remote desktop clients (WorkSpaces, AppStream 2.0, DCV) that could allow attackers to intercept and potentially access remote sessions. The vulnerability affects users of these AWS services when using the native client applications. Attackers positioned between clients and AWS infrastructure could exploit insufficient certificate validation.

💻 Affected Systems

Products:

Amazon WorkSpaces Client
Amazon AppStream 2.0 Client
Amazon DCV Client

Versions: Versions prior to those specified in AWS security bulletins (check specific product documentation for exact versions)

Operating Systems: Windows, macOS, Linux

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects native client applications using Amazon DCV protocol; web-based clients may not be affected. Requires man-in-the-middle position between client and AWS service.

⚠️ Manual Verification Required

This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.

Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).

🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.

Recommended Actions:

Review the CVE details at NVD
Check vendor security advisories for your specific version
Test if the vulnerability is exploitable in your environment
Consider updating to the latest version as a precaution

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could intercept and hijack active remote desktop sessions, gaining unauthorized access to sensitive data and systems, potentially leading to data theft, lateral movement, or ransomware deployment.

🟠

Likely Case

Session interception allowing attackers to monitor and potentially manipulate remote desktop traffic, leading to credential theft or data exfiltration.

🟢

If Mitigated

With proper network segmentation, certificate pinning, and updated clients, risk is limited to denial of service or failed connection attempts.

🌐 Internet-Facing: HIGH - Remote desktop clients often connect over public internet to AWS services, creating multiple potential interception points.

🏢 Internal Only: MEDIUM - Internal network attacks still possible but require attacker presence on internal network segments.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires man-in-the-middle position and ability to intercept TLS connections. Exploitation depends on network positioning and certificate validation bypass.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check specific product documentation for patched versions: WorkSpaces Client 4.4.0+, AppStream 2.0 Client 1.2.0+, DCV Client 2023.1+

Vendor Advisory: https://aws.amazon.com/security/security-bulletins/AWS-2025-001/

Restart Required: No

Instructions:

1. Review AWS security bulletin AWS-2025-001. 2. Update Amazon WorkSpaces Client to version 4.4.0 or later. 3. Update Amazon AppStream 2.0 Client to version 1.2.0 or later. 4. Update Amazon DCV Client to version 2023.1 or later. 5. Verify updates via client version checks.

🔧 Temporary Workarounds

Network Segmentation and Monitoring

all

Implement strict network controls to prevent man-in-the-middle attacks on remote desktop traffic

Certificate Pinning

all

Implement certificate pinning for AWS endpoints to prevent certificate validation bypass

🧯 If You Can't Patch

Use web-based clients instead of native applications where available
Implement network-level protections including VPNs with certificate validation and network segmentation

🔍 How to Verify

Check if Vulnerable:

Check client version against minimum secure versions in AWS documentation. Older versions are vulnerable.

Check Version:

Windows: Check About in client GUI. macOS/Linux: Check application version in About menu or via package manager.

Verify Fix Applied:

Confirm client version meets or exceeds minimum secure versions specified in AWS security bulletins.

📡 Detection & Monitoring

Log Indicators:

Failed TLS handshakes
Certificate validation errors
Unexpected connection resets

Network Indicators:

Unusual TLS certificate changes
Man-in-the-middle attack patterns
Suspicious proxy activity

SIEM Query:

Search for: 'certificate validation failed' OR 'TLS handshake error' AND (source: 'amazon-workspaces' OR 'appstream' OR 'dcv')

📊 Metadata

CVE ID: CVE-2025-0500

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-295

EPSS Score: 0.3% exploit probability (53.3th percentile)

Published: January 15, 2025

Last Updated: October 14, 2025

🔗 References

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🔗 Related Vulnerabilities

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