What is the CVSS score of CVE-2019-18935?

CVE-2019-18935 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 93.6%.

Is there a public PoC exploit available for CVE-2019-18935?

Yes, a public proof-of-concept exploit is available for CVE-2019-18935. Prioritise patching immediately. EPSS: 93.6%.

How to fix or mitigate CVE-2019-18935?

Within 24 hours: Identify all affected systems and apply vendor patches immediately. Restrict deserialization to trusted data sources and implement integrity checks.

CVE-2019-18935

CRITICAL

Deserialization of Untrusted Data (CWE-502)

2019-12-11 cve@mitre.org

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 26, 2026 - 11:19 vuln.today

Added to CISA KEV

Nov 07, 2025 - 19:37 cisa

CISA KEV

PoC Detected

Nov 07, 2025 - 19:37 vuln.today

Public exploit code

Patch released

Nov 07, 2025 - 19:37 nvd

Patch available

CVE Published

Dec 11, 2019 - 13:15 nvd

CRITICAL 9.8

DescriptionCVE.org

Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)

AnalysisAI

Progress Telerik UI for ASP.NET AJAX contains a .NET deserialization vulnerability in RadAsyncUpload that allows unauthenticated remote code execution when encryption keys are known, exploited by APT groups and ransomware operators.

Technical ContextAI

The CWE-502 deserialization flaw exists in the RadAsyncUpload handler's processing of serialized .NET objects. The handler uses encryption to protect upload parameters, but if the key is known (via prior CVEs or default configurations), an attacker can craft encrypted payloads containing malicious serialized objects for code execution.

Affected ProductsAI

Progress Telerik UI for ASP.NET AJAX through 2019.3.1023

RemediationAI

Update Telerik UI to 2020.1.114+. Change default encryption keys to unique, random values. Implement .NET serialization binders to restrict deserializable types. Monitor for web shells in Telerik upload directories.