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CVE-2017-11317

From Exploited flaws, HARD’s guide to the flaws being used in attacks · Checked
This article is about a flaw in Telerik User Interface (UI) for ASP.NET AJAX. For every flaw being used in attacks, see Exploited flaws.

CVE-2017-11317 is a security flaw in Telerik User Interface (UI) for ASP.NET AJAX. Attackers can run their own code on Telerik User Interface (UI) for ASP.NET AJAX. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 11 Apr 2022.[1]

Telerik User Interface (UI) for ASP.NET AJAX is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff.

Description

CISA calls it a UI for ASP.NET AJAX unrestricted file upload in Telerik User Interface (UI) for ASP.NET AJAX. In its words: “Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX allows remote attackers to perform arbitrary file uploads or execute arbitrary code.”[1]

The CVE record adds: “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.”[2]

The underlying weakness is CWE-326, in MITRE’s list of common software weaknesses.

It scores 9.8 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by NVD using CVSS 3.1.[2]

Affected versions

NVD’s record doesn’t list version ranges for it. CISA names the product as Telerik User Interface (UI) for ASP.NET AJAX.

Most families won’t have Telerik User Interface (UI) for ASP.NET AJAX; it’s for whoever looks after IT at work.

Exploitation

CISA added it to its catalog of known exploited vulnerabilities on 11 Apr 2022, 1,692 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 2 May 2022 to fix it.[1]

FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 84%. That’s in the top 1% of the flaws it scores.[3]

CISA assesses it as automatable: attackers can run it against many targets at once.

CISA doesn’t say who was attacked, or how.

Fix

CISA’s required action: “Apply updates per vendor instructions.”[1]

  1. Check whether you use it.Telerik User Interface (UI) for ASP.NET AJAX is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
  2. Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 2 May 2022 to fix it.
  3. If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.

You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.

Timeline

DateEvent
The flaw is made public in the National Vulnerability Database, with a severity score of 9.8.[2]
CISA adds it to its catalog of flaws known to be used in attacks.[1]
CISA’s deadline for US government agencies to fix it.[1]
FIRST puts the odds of it being used in attacks in the next 30 days at 84%.[3]

See also

Other Telerik User Interface (UI) for ASP.NET AJAX flaws

  • CVE-2017-11357: UI for ASP.NET AJAX insecure direct object reference ·

Similar flaws

  • CVE-2017-1000486, Primetek Primefaces Application: primefaces remote code execution ·
  • CVE-2018-18325, DotNetNuke (DNN): inadequate encryption strength ·
  • CVE-2018-15811, DotNetNuke (DNN): inadequate encryption strength ·

Added the same day

  • CVE-2022-23176, WatchGuard Firebox and XTM: privilege escalation ·
  • CVE-2021-42287, Microsoft Active Directory: domain services privilege escalation ·
  • CVE-2021-42278, Microsoft Active Directory: domain services privilege escalation ·
  • CVE-2021-39793, Google Pixel: out-of-bounds write ·
  • CVE-2021-27852, Checkbox Survey: survey deserialization of untrusted data ·

References

  1. ^ Cybersecurity and Infrastructure Security Agency. “Telerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability”. Known Exploited Vulnerabilities Catalog, added 11 Apr 2022.
  2. ^ National Institute of Standards and Technology. “CVE-2017-11317 Detail”. National Vulnerability Database, published 23 Aug 2017.
  3. ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.842, percentile 99.7, 31 Oct 2026.
  4. CVE Program. “CVE-2017-11317”. The official CVE record.

This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.