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Fencer Vulns
critical 9.8

CVE-2019-18935 kev+ ransomware in the critical feed json

Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function.

published 2019-12-11 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-8608

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03, used in ransomware
epss
99.7%
EPSS 99.7% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit, Exploit-DB

Summary

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.)

Patch / fix

cisa required action Apply updates per vendor instructions.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-077-03 updated cvss 9.8

Hitachi ABB Power Grids eSOMS Telerik

  • Hitachi Energy eSOMS < 6.3 of telerik software
    affected: vendor fix, mitigation “For additional information and support, contact a product provider or Hitachi ABB Power Grids service organization. For contact information, visit Hitachi ABB Power Grids contact-centers.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Timeline

  1. First public exploit (Metasploit exploit/windows/http/telerik_rau_deserialization)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2022-05-03 (4 y ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply updates per vendor instructions.
Vendor, product
Progress, Telerik UI for ASP.NET AJAX
CISA name
Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1190 Exploit Public-Facing Application exploitation
  • T1041 Exfiltration Over C2 Channel primary impact
  • T1496 Resource Hijacking primary impact
  • T1505.003 Web Shell primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
21 mo ago

Exploit prediction

99.74% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/windows/http/telerik_rau_deserialization Telerik UI ASP.NET AJAX RadAsyncUpload Deserialization metasploit exploit, excellent rank, 2019-12-09
  • EDB-47793 Telerik UI - Remote Code Execution via Insecure Deserialization webapps, 2019-12-18
  • github.com https://github.com/bao7uo/RAU_crypto referenced PoC, tagged "exploit" by a source, unverified
  • know.bishopfox.com https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/noperator/CVE-2019-18935 referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.