What is CVE-2017-11317?

CVE-2017-11317 is a critical-severity vulnerability in Telerik Ui For Asp.net Ajax, classified under Inadequate Encryption Strength. CVSS score: 9.8/10. Published 2017-08-23.

How severe is CVE-2017-11317?

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

Is CVE-2017-11317 known to be exploited?

Yes. CVE-2017-11317 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating it is being actively exploited. 26 public proof-of-concept repositories are indexed.

Vulnerability in Telerik Ui For Asp.net Ajax

CVE-2017-11317

Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX before R1 2017 and R2 before R2 2017 SP2 uses weak RadAsyncUpload encryption, which allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

Published 2017-08-23 · last modified 2026-06-17.

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: 0.842 (99.7th percentile), scored 2026-10-19.

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.842 · newest: 0.842 · change: 0.000

Affected products

Telerik Ui For Asp.net Ajax — versions 2017.2.503, 2017.2.621

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-04-11. 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: 2022-05-02.

Required action: Apply updates per vendor instructions.

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/unrestricted-file… (Mitigation, Vendor Advisory)
psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0006 (Third Party Advisory)
packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Des… (Exploit, VDB Entry, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2017-11317?: CVE-2017-11317 is a critical-severity vulnerability in Telerik Ui For Asp.net Ajax, classified under Inadequate Encryption Strength. CVSS score: 9.8/10. Published 2017-08-23.
How severe is CVE-2017-11317?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2017-11317 known to be exploited?: Yes. CVE-2017-11317 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11), indicating it is being actively exploited. 26 public proof-of-concept repositories are indexed.