CVE-2019-18935

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.)

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
100.0%
KEV
⚠ Exploited

Published

December 11, 2019

Last Modified

November 7, 2025

Advisory Details (9)

Auto-updated Jun 1, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Release History for Telerik Products

https://www.telerik.com/support/whats-new/release-history
generic

Telerik UI for ASP.NET AJAX - UI for ASP.NET AJAX R1 2020 (version 2020.1.114)

https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29
generic

Telerik Web Forms Allows JavaScriptSerializer Deserialization - Telerik UI for ASP.NET AJAX

https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
generic🔴 Active Exploitation

US federal agency hacked using old Telerik bug to steal data

https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/
generic

CVE-2019-18935: Remote Code Execution via Insecure… | Bishop Fox

https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui
generic🔴 Active Exploitation

GitHub - noperator/CVE-2019-18935: RCE exploit for a .NET JSON deserialization vulnerability in Telerik UI for ASP.NET AJAX. · GitHub

https://github.com/noperator/CVE-2019-18935
generic

GitHub - bao7uo/RAU_crypto: Telerik UI for ASP.NET AJAX File upload and .NET deserialisation exploit (CVE-2017-11317, CVE-2017-11357, CVE-2019-18935) · GitHub

https://github.com/bao7uo/RAU_crypto
generic

CODE WHITE | Blog: Telerik Revisited

https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html
generic

Packet Storm

http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 44× in last 7d / 196× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 367 total refreshes for this CVE.

  1. 2026-07-23 01:42 UTCEG score recompute
  2. 2026-07-23 00:18 UTCEG score recompute
  3. 2026-07-23 00:17 UTCGHSA enrichment
  4. 2026-07-22 22:22 UTCEG score recompute
  5. 2026-07-22 20:18 UTCGHSA enrichment
  6. 2026-07-22 19:40 UTCCISA KEV update
  7. 2026-07-22 16:19 UTCGHSA enrichment
  8. 2026-07-22 12:19 UTCGHSA enrichment
  9. 2026-07-22 08:21 UTCGHSA enrichment
  10. 2026-07-22 04:23 UTCGHSA enrichment
  11. 2026-07-22 00:24 UTCGHSA enrichment
  12. 2026-07-21 18:43 UTCGHSA enrichment
  13. 2026-07-21 14:44 UTCGHSA enrichment
  14. 2026-07-21 14:37 UTCCISA KEV update
  15. 2026-07-21 10:45 UTCGHSA enrichment
  16. 2026-07-21 06:44 UTCGHSA enrichment
  17. 2026-07-21 02:46 UTCGHSA enrichment
  18. 2026-07-20 22:47 UTCGHSA enrichment
  19. 2026-07-20 18:49 UTCGHSA enrichment
  20. 2026-07-20 14:52 UTCGHSA enrichment
  21. 2026-07-20 10:47 UTCGHSA enrichment
  22. 2026-07-20 06:49 UTCGHSA enrichment
  23. 2026-07-20 02:30 UTCGHSA enrichment
  24. 2026-07-19 22:31 UTCGHSA enrichment
  25. 2026-07-19 18:34 UTCGHSA enrichment
Show 75 more
  1. 2026-07-19 14:36 UTCGHSA enrichment
  2. 2026-07-19 10:37 UTCGHSA enrichment
  3. 2026-07-19 06:38 UTCGHSA enrichment
  4. 2026-07-19 02:40 UTCGHSA enrichment
  5. 2026-07-18 22:42 UTCGHSA enrichment
  6. 2026-07-18 18:44 UTCGHSA enrichment
  7. 2026-07-18 14:46 UTCGHSA enrichment
  8. 2026-07-18 10:48 UTCGHSA enrichment
  9. 2026-07-18 06:50 UTCGHSA enrichment
  10. 2026-07-18 02:52 UTCGHSA enrichment
  11. 2026-07-17 22:54 UTCGHSA enrichment
  12. 2026-07-17 18:56 UTCGHSA enrichment
  13. 2026-07-17 14:58 UTCGHSA enrichment
  14. 2026-07-17 11:00 UTCGHSA enrichment
  15. 2026-07-17 07:02 UTCGHSA enrichment
  16. 2026-07-17 03:04 UTCGHSA enrichment
  17. 2026-07-16 23:06 UTCGHSA enrichment
  18. 2026-07-16 19:08 UTCGHSA enrichment
  19. 2026-07-16 17:04 UTCCISA KEV update
  20. 2026-07-16 15:09 UTCGHSA enrichment
  21. 2026-07-16 11:11 UTCGHSA enrichment
  22. 2026-07-16 07:12 UTCGHSA enrichment
  23. 2026-07-16 03:15 UTCGHSA enrichment
  24. 2026-07-15 23:17 UTCGHSA enrichment
  25. 2026-07-15 19:18 UTCGHSA enrichment
  26. 2026-07-15 16:49 UTCCISA KEV update
  27. 2026-07-15 15:20 UTCGHSA enrichment
  28. 2026-07-15 15:04 UTCCISA KEV update
  29. 2026-07-15 11:21 UTCGHSA enrichment
  30. 2026-07-15 07:21 UTCGHSA enrichment
  31. 2026-07-15 03:22 UTCGHSA enrichment
  32. 2026-07-14 23:24 UTCGHSA enrichment
  33. 2026-07-14 19:25 UTCGHSA enrichment
  34. 2026-07-14 18:05 UTCCISA KEV update
  35. 2026-07-14 15:26 UTCGHSA enrichment
  36. 2026-07-14 11:29 UTCGHSA enrichment
  37. 2026-07-14 07:31 UTCGHSA enrichment
  38. 2026-07-14 03:33 UTCGHSA enrichment
  39. 2026-07-13 23:36 UTCGHSA enrichment
  40. 2026-07-13 19:38 UTCGHSA enrichment
  41. 2026-07-13 17:07 UTCCISA KEV update
  42. 2026-07-13 15:40 UTCGHSA enrichment
  43. 2026-07-13 11:42 UTCGHSA enrichment
  44. 2026-07-13 07:44 UTCGHSA enrichment
  45. 2026-07-13 03:46 UTCGHSA enrichment
  46. 2026-07-12 23:48 UTCGHSA enrichment
  47. 2026-07-12 19:50 UTCGHSA enrichment
  48. 2026-07-12 15:51 UTCGHSA enrichment
  49. 2026-07-12 11:53 UTCGHSA enrichment
  50. 2026-07-12 07:55 UTCGHSA enrichment
  51. 2026-07-12 05:43 UTCEPSS rescore
  52. 2026-07-12 05:43 UTCEPSS rescore
  53. 2026-07-12 03:57 UTCGHSA enrichment
  54. 2026-07-11 23:59 UTCGHSA enrichment
  55. 2026-07-11 20:01 UTCGHSA enrichment
  56. 2026-07-11 16:03 UTCGHSA enrichment
  57. 2026-07-11 12:05 UTCGHSA enrichment
  58. 2026-07-11 08:07 UTCGHSA enrichment
  59. 2026-07-11 04:09 UTCGHSA enrichment
  60. 2026-07-11 00:11 UTCGHSA enrichment
  61. 2026-07-10 20:10 UTCGHSA enrichment
  62. 2026-07-10 17:52 UTCCISA KEV update
  63. 2026-07-10 16:11 UTCGHSA enrichment
  64. 2026-07-10 12:11 UTCGHSA enrichment
  65. 2026-07-10 08:13 UTCGHSA enrichment
  66. 2026-07-10 04:15 UTCGHSA enrichment
  67. 2026-07-10 00:17 UTCGHSA enrichment
  68. 2026-07-09 20:16 UTCGHSA enrichment
  69. 2026-07-09 16:18 UTCGHSA enrichment
  70. 2026-07-09 12:20 UTCGHSA enrichment
  71. 2026-07-09 08:22 UTCGHSA enrichment
  72. 2026-07-09 04:24 UTCGHSA enrichment
  73. 2026-07-09 00:26 UTCGHSA enrichment
  74. 2026-07-08 20:29 UTCGHSA enrichment
  75. 2026-07-08 16:31 UTCGHSA enrichment

Publicly available exploits

(10 references)

Working exploit code is in the public domain (1 Metasploit module) (8 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCekkoo-z/CVE-2019-18935-bypasswaf
    First seen Jul 9, 2025
    Open source ↗
  • GitHub PoCdust-life/CVE-2019-18935-memShell
    First seen Dec 25, 2023
    Open source ↗
  • GitHub PoCrandom-robbie/CVE-2019-18935
    First seen Sep 30, 2020

    CVE-2019-18935

    Open source ↗
  • GitHub PoCmurataydemir/CVE-2019-18935
    First seen Aug 19, 2020

    [CVE-2019-18935] Telerik UI for ASP.NET AJAX (RadAsyncUpload Handler) .NET JSON Deserialization

    Open source ↗
  • GitHub PoCThanHuuTuan/CVE_2019_18935
    First seen May 29, 2020

    This project for CVE-2019-18935

    Open source ↗
  • GitHub PoCThanHuuTuan/Telerik_CVE-2019-18935
    First seen May 25, 2020

    TelerikUI Vulnerability Scanner (CVE-2019-18935)

    Open source ↗
  • Exploit-DBEDB-47793
    First seen Dec 18, 2019

    Telerik UI - Remote Code Execution via Insecure Deserialization

    Open source ↗
  • GitHub PoCnoperator/CVE-2019-18935
    First seen Dec 12, 2019

    RCE exploit for a .NET JSON deserialization vulnerability in Telerik UI for ASP.NET AJAX.

    Open source ↗
  • Metasploitexploit/windows/http/telerik_rau_deserialization✓ verified
    First seen Dec 9, 2019

    Telerik UI ASP.NET AJAX RadAsyncUpload Deserialization

    Open source ↗
  • GitHub PoCbao7uo/RAU_crypto
    First seen Jan 9, 2018

    Telerik UI for ASP.NET AJAX File upload and .NET deserialisation exploit (CVE-2017-11317, CVE-2017-11357, CVE-2019-18935)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2019-18935?
CVE-2019-18935 is a critical vulnerability published on December 11, 2019. 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…
When was CVE-2019-18935 disclosed?
CVE-2019-18935 was first published in the National Vulnerability Database on December 11, 2019, with the most recent update on November 7, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-18935 actively exploited?
Yes. CISA added CVE-2019-18935 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Progress Telerik UI for ASP.NET AJAX. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-18935?
CVE-2019-18935 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2019-18935?
CVE-2019-18935 affects Progress Telerik UI for ASP.NET AJAX. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2019-18935?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18935, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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