What is CVE-2017-11357?

CVE-2017-11357 is a critical-severity vulnerability in Progress Telerik Ui For Asp.net Ajax, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2017-08-23.

How severe is CVE-2017-11357?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2017-11357 known to be exploited?

Yes. CVE-2017-11357 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-01-26), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.

Arbitrary file upload in Progress Telerik Ui For Asp.net Ajax

CVE-2017-11357

Progress Telerik UI for ASP.NET AJAX before R2 2017 SP2 does not properly restrict user input to RadAsyncUpload, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

Vulnerability class: Unrestricted File Upload

Published 2017-08-23 · last modified 2026-08-14.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.777 (99.6th percentile), scored 2026-10-19.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.777 · newest: 0.777 · change: 0.000

Affected products

Progress Telerik Ui For Asp.net Ajax

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-01-26. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-02-16.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

www.exploit-db.com/exploits/43874/ (Exploit, VDB Entry, Third Party Advisory, exploit)
www.telerik.com/support/kb/aspnet-ajax/upload-(async)/details/insecure-direct-o… (Mitigation, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-11357?: CVE-2017-11357 is a critical-severity vulnerability in Progress Telerik Ui For Asp.net Ajax, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2017-08-23.
How severe is CVE-2017-11357?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2017-11357 known to be exploited?: Yes. CVE-2017-11357 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-01-26), indicating it is being actively exploited. 18 public proof-of-concept repositories are indexed.