CVE-2019-18935
Confirmed PUBLISHEDProgress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.)
- CVE Published
- Dec 11, 2019
- Exploitation Reported
- Nov 03, 2021
- CVSS
- 9.8 Critical
- EPSS
- 99.7%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| n/a |
n/a
|
n/a |
Affected |
CVE References
- telerik.com/support/whats-new/release-history telerik.com · CVE Record https://www.telerik.com/support/whats-new/release-history
- codewhitesec.blogspot.com/2019/02/telerik-revisited.html codewhitesec.blogspot.com · CVE Record https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html
- telerik.com/support/kb/aspnet-ajax/details/allows-javasc... telerik.com · CVE Record https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascr...
- GitHub — bao7uo/RAU_crypto github.com · CVE Record https://github.com/bao7uo/RAU_crypto
- know.bishopfox.com/research/cve-2019-18935-remote-code-executio... know.bishopfox.com · CVE Record https://know.bishopfox.com/research/cve-2019-18935-remote-code-execut...
Show 5 more references
- GitHub — noperator/CVE-2019-18935 github.com · CVE Record https://github.com/noperator/CVE-2019-18935
- packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Executio... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Ex...
- telerik.com/support/whats-new/aspnet-ajax/release-histor... telerik.com · CVE Record https://www.telerik.com/support/whats-new/aspnet-ajax/release-history...
- packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyn... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-R...
- bleepingcomputer.com/news/security/us-federal-agency-hacked-using... bleepingcomputer.com · CVE Record https://www.bleepingcomputer.com/news/security/us-federal-agency-hack...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2021-11-03 00:00 UTC |
| The Shadowserver | 2026-07-12 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/telerik_rau_deserialization.rb | Apr 28, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2021-11-03 00:00:00 UTC · CISA
Used in malware
Recorded 2021-11-03 00:00:00 UTC · CISA
Proof of concept available
Recorded 2019-12-12 07:58:11 UTC · GitHub
Weaknesses (CWE)
-
Deserialization of Untrusted Data
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/telerik_rau_deserialization.rb | Apr 28, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2023-12-25 06:45:11 UTC · 6 stars
github · Created 2020-08-19 17:11:02 UTC · 15 stars
[CVE-2019-18935] Telerik UI for ASP.NET AJAX (RadAsyncUpload Handler) .NET JSON Deserialization
github · Created 2020-05-25 08:37:51 UTC · 12 stars
TelerikUI Vulnerability Scanner (CVE-2019-18935)
github · Created 2019-12-12 07:58:11 UTC · 351 stars
RCE exploit for a .NET JSON deserialization vulnerability in Telerik UI for ASP.NET AJAX.
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 11 days ago00:00 UTC · 11 days ago
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
15:02 UTC about 1 year ago15:02 UTC · about 1 year ago
Metasploit module available
Exploit module available
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
First public exploitation report
Exploit observed in malware
-
07:58 UTC over 6 years ago07:58 UTC · over 6 years ago
Public PoC available
Public proof-of-concept code published
-
00:00 UTC over 6 years ago00:00 UTC · over 6 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 6 years ago00:00 UTC · over 6 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2019-18935
{
"cve_id": "CVE-2019-18935",
"title": "Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET dese...",
"affected_vendor": "Progress",
"affected_product": "Telerik UI for ASP.NET AJAX",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": 0.99737,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}