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CVE-2019-18935

Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can …

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Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)
CVSS 9.8 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
9.0/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.8: +1.47
  • Fresh EPSS: 99.74%: +0.50

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 10 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

watchTowr Labs
Press · 10 Oct 2025, 07:00 · More Than DoS (Progress Telerik UI for ASP.NET AJAX Unsafe Reflection CVE-2025-3600) - watchTowr Labs
GBHackers News
Press · 20 Sep 2023, 07:00 · Hackers Deployed never-before-seen Linux Malware Attacking Government Entities - GBHackers News
Industrial Cyber
Press · 16 Mar 2023, 07:00 · US agencies warn of hackers exploiting Progress Telerik vulnerability in government IIS web server - Industrial Cyber
The Hacker News
Press · 16 Mar 2023, 07:00 · Multiple Hacker Groups Exploit 3-Year-Old Vulnerability to Breach U.S. Federal Agency - The Hacker News
TechTarget
Press · 16 Mar 2023, 07:00 · U.S. federal agency hacked via 3-year-old Telerik UI flaw - TechTarget
See all 10 source documents
BleepingComputer
Press · 15 Mar 2023, 07:00 · US federal agency hacked using old Telerik bug to steal data - BleepingComputer
SOC Prime
Press · 17 Jun 2022, 07:00 · Telerik UI Vulnerability Exploit Detection: Blue Mockingbird Leverages CVE-2019-18935 - SOC Prime
BleepingComputer
Press · 15 Jun 2022, 07:00 · Hackers exploit three-year-old Telerik flaws to deploy Cobalt Strike - BleepingComputer
The Hacker News
Press · 29 Jul 2021, 07:00 · Top 30 Critical Security Vulnerabilities Most Exploited by Hackers - The Hacker News
BleepingComputer
Press · 23 Apr 2020, 07:00 · NSA: Hackers exploit these vulnerabilities to deploy backdoors - BleepingComputer

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 9.0 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

1

Public exploit entries / repo candidates

Source entries and unverified repository candidates are counted separately.

Public exploit evidence
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 9.8; EPSS 99.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:06.921295+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
11 Dec 2019, 00:00
First press mention
23 Apr 2020, 07:00
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
10 Oct 2025, 07:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
1 repositories