How severe is CVE-2017-11357?

CVE-2017-11357 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-11357 being actively exploited?

Yes. CVE-2017-11357 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-01-26, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2017-11357?

CVE-2017-11357 affects Progress Telerik Ui For Asp.net Ajax. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-11357?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2017-11357 have an EU (EUVD) identifier?

Yes. CVE-2017-11357 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-2986. It is also flagged as exploited in the EUVD (since 2023-01-26).

When was CVE-2017-11357 published?

CVE-2017-11357 was published on 2017-08-23 and last updated on 2026-08-14.

CVE-2017-11357

CVE-2017-11357 is a critical-severity vulnerability in Progress Telerik Ui For Asp.net Ajax with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-01-26). The underlying weakness is classified as CWE-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 76% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2023-01-26)
EU (EUVD) id: EUVD-2017-2986
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-01-26)
Weakness: CWE-434
Affected product: Progress Telerik Ui For Asp.net Ajax
Published: 2017-08-23
Last modified: 2026-08-14

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.

Frequently asked questions

What is 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.
How severe is CVE-2017-11357?: CVE-2017-11357 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-11357 being actively exploited?: Yes. CVE-2017-11357 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-01-26, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2017-11357?: CVE-2017-11357 affects Progress Telerik Ui For Asp.net Ajax. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-11357?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2017-11357 have an EU (EUVD) identifier?: Yes. CVE-2017-11357 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2017-2986. It is also flagged as exploited in the EUVD (since 2023-01-26).
When was CVE-2017-11357 published?: CVE-2017-11357 was published on 2017-08-23 and last updated on 2026-08-14.

References

Affected products (1)

cpe:2.3:a:progress:telerik_ui_for_asp.net_ajax:*:*:*:*:*:*:*:*

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