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CVE-2019-18935

9.8, critical Known exploited Used in ransomware

Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
100% higher than 99.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
11 Dec 20196 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Nov 2021 and links it to ransomware activity. US federal agencies had to remediate by 3 May 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

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.)

Details

Vendor
Progress
Product
Ui For Asp.net Ajax
Weakness
CWE-502 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

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

References 11

Exploit code 5

Patches and fixes 1

Advisories 2

Other references 3

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Progress CVEs

Every Progress CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-8037 Progress LoadMaster Command Injection Vulnerability KEV EPSS 77% 9.8, critical
  • CVE-2024-6670 Progress WhatsUp Gold SQL Injection Vulnerability KEV EPSS 93% 9.8, critical
  • CVE-2024-4885 Progress WhatsUp Gold Path Traversal Vulnerability KEV EPSS 99% 9.8, critical
  • CVE-2024-4358 Progress Telerik Report Server Authentication Bypass by Spoofing Vulnerability KEV EPSS 97% 9.8, critical
  • CVE-2024-1212 Progress Kemp LoadMaster OS Command Injection Vulnerability KEV EPSS 95% 9.8, critical
  • CVE-2023-40044 Progress WS_FTP Server Deserialization of Untrusted Data Vulnerability KEV EPSS 90% 8.8, high
  • CVE-2023-34362 Progress MOVEit Transfer SQL Injection Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2017-9248 Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability KEV EPSS 75% 9.8, critical

Beyond this page

Is CVE-2019-18935 in your network?

This page tells you how dangerous CVE-2019-18935 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2019-18935 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2019-18935 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.