# Progress Telerik Fiddler Classic vulnerabilities

Source: https://junglewise.ai/threats/technologies/telerik-fiddler-classic  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/telerik-fiddler-classic.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Progress Telerik Fiddler Classic: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-77805, was published on 5 October 2026. Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 3
- All time: 3 (0 critical, 0 exploited in the wild)

## About Progress Telerik Fiddler Classic

HTTP debugging proxy tool for inspecting and modifying network traffic between applications and servers.

## Latest Progress Telerik Fiddler Classic vulnerabilities

- [CVE-2026-77805: Progress Telerik Fiddler Classic weak signature verification](https://junglewise.ai/threats/cve-2026-77805-in-progress-telerik-fiddler-classic-for-windows-versions-prior-to) (high, CVSS 7.9, published 5 Oct 2026)
- [CVE-2026-77804: Progress Telerik Fiddler Classic TOCTOU race condition in certificate installation](https://junglewise.ai/threats/cve-2026-77804-in-progress-telerik-fiddler-classic-for-windows-versions-prior-to) (medium, CVSS 6.6, published 5 Oct 2026)
- [CVE-2026-77802: Progress Telerik Fiddler Classic HTTP request smuggling](https://junglewise.ai/threats/cve-2026-77802-in-progress-telerik-fiddler-classic-for-windows-versions-prior-to) (medium, CVSS 6.3, published 5 Oct 2026)

## Most severe Progress Telerik Fiddler Classic vulnerabilities

- [CVE-2026-77805: Progress Telerik Fiddler Classic weak signature verification](https://junglewise.ai/threats/cve-2026-77805-in-progress-telerik-fiddler-classic-for-windows-versions-prior-to) (high, CVSS 7.9, published 5 Oct 2026)
- [CVE-2026-77804: Progress Telerik Fiddler Classic TOCTOU race condition in certificate installation](https://junglewise.ai/threats/cve-2026-77804-in-progress-telerik-fiddler-classic-for-windows-versions-prior-to) (medium, CVSS 6.6, published 5 Oct 2026)
- [CVE-2026-77802: Progress Telerik Fiddler Classic HTTP request smuggling](https://junglewise.ai/threats/cve-2026-77802-in-progress-telerik-fiddler-classic-for-windows-versions-prior-to) (medium, CVSS 6.3, published 5 Oct 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 3 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Progress technologies

- [Progress Marklogic Server](https://junglewise.ai/threats/technologies/marklogic-server): 41 vulnerabilities
- [Progress MOVEit Transfer](https://junglewise.ai/threats/technologies/moveit-transfer): 26 vulnerabilities
- [Progress Kendo UI for jQuery](https://junglewise.ai/threats/technologies/kendo-ui-for-jquery): 25 vulnerabilities
- [Progress WhatsUp Gold](https://junglewise.ai/threats/technologies/whatsup-gold): 7 vulnerabilities
- [Progress LoadMaster](https://junglewise.ai/threats/technologies/loadmaster): 6 vulnerabilities
- [Progress Sitefinity](https://junglewise.ai/threats/technologies/sitefinity): 6 vulnerabilities
- [Progress ADC](https://junglewise.ai/threats/technologies/adc): 5 vulnerabilities
- [Progress Connection Manager for ObjectScale](https://junglewise.ai/threats/technologies/connection-manager-for-objectscale): 5 vulnerabilities
- [Progress ECS Connection Manager](https://junglewise.ai/threats/technologies/ecs-connection-manager): 5 vulnerabilities
- [Progress Telerik Document Processing Libraries](https://junglewise.ai/threats/technologies/telerik-document-processing-libraries): 5 vulnerabilities
- [Progress Telerik Report Server](https://junglewise.ai/threats/technologies/telerik-report-server): 5 vulnerabilities
- [Progress ShareFile Storage Zones Controller](https://junglewise.ai/threats/technologies/progress-sharefile-storage-zones-controller): 4 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Progress Telerik Fiddler Classic vulnerabilities", https://junglewise.ai/threats/technologies/telerik-fiddler-classic, 13 November 2026.