CVE-2017-11357
CriticalExploitedPublic exploitProgress 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.
Published Mar 19, 2021 · Updated Aug 14, 2026
Key Facts
Patch immediately- CVE-2017-11357 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Telerik Ui For Asp.net Ajax (Progress).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 20, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 78% probability of exploitation in the next 30 days.
- Fixed versions are available, including Telerik Ui For Asp.net Ajax 2020.1.114.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
78%
Higher than 99.5% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2017-11357 brief as a PDF
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 26, 2023 | Feb 16, 2023 | Known |
| Industry KEV feed | Oct 20, 2020 | Feb 16, 2023 | Known |
| CIRCL KEV | Jan 26, 2023 | Feb 16, 2023 | Known |
| ENISA EUVD | Jan 26, 2023 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Telerik Ui For Asp.net AjaxProgress | See advisory | 2020.1.114 |
Patched Releases
Telerik Ui For Asp.net Ajax
2020.1.114
Timeline
Added to Industry KEV feed
Oct 20, 2020
Publicly disclosed
Mar 19, 2021
Added to CISA KEV
Jan 26, 2023
Added to CIRCL KEV
Jan 26, 2023
Added to ENISA EUVD
Jan 26, 2023
Last updated
Aug 14, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://us-cert.cisa.gov/ics
- advisoryhttps://us-cert.cisa.gov/ics/advisories/icsa-21-077-02
- advisoryhttps://us-cert.cisa.gov/report
- advisoryhttps://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- advisoryhttps://www.hitachiabb-powergrids.com/contact-us/
FAQ
Common Questions.
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.
Affected: Telerik Ui For Asp.net Ajax (Progress). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Oct 20, 2020 and is known to be used in ransomware campaigns.
Yes. It was added on Jan 26, 2023 with a federal remediation due date of Feb 16, 2023.
Public exploit code is available.
Fixed versions are available, including Telerik Ui For Asp.net Ajax 2020.1.114.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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