# CVE-2026-19977: EFM ipTIME A3004T authentication bypass in session validation

Source: https://junglewise.ai/threats/cve-2026-19977-efm-iptime-a3004t-authentication-bypass-in-session-validation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-17. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-19977 · Severity: critical · CVSS 10 · Published 2026-08-17

The ipTIME A3004T is a residential router used to provide internet connectivity and network management. A flaw in the session validation logic allows unauthenticated remote attackers to bypass login authentication and reset the administrator password, gaining complete control of the device. This gives attackers unfettered access to all network traffic and router configurations.

## Quick answers

**Is CVE-2026-19977 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19977 being exploited in the wild.

**How severe is CVE-2026-19977?** Critical severity, with a CVSS score of 10, published 17 August 2026.

**Which products and versions are affected?** EFM ipTIME A3004T 14.19.0.

**Is there a fix for CVE-2026-19977?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-19977 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-19977?** Check whether you run EFM ipTIME A3004T at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authentication bypass in the httpcon_check_session_url function within the Session Validation component of the firmware. The function determines whether to enforce authentication solely by checking if the request URL begins with "/sess-bin/"; requests to other paths like "/cgi/timepro.cgi" bypass the authentication check. This logical flaw allows an unauthenticated remote attacker to directly access the password reset endpoint and invoke administrative functions without credentials. The attack is network-reachable and requires no prior authentication or user interaction. No patch availability information is available; the vendor was contacted early but did not respond.

## Affected products

- EFM ipTIME A3004T 14.19.0

## Timeline

- 2026-08-17: disclosed
- 2026-06-30: other: Exploit details publicly disclosed on GitHub

## References

- [https://github.com/AdminSafe/CVE/issues/1](https://github.com/AdminSafe/CVE/issues/1)
- [https://vuldb.com/cve/CVE-2026-19977](https://vuldb.com/cve/CVE-2026-19977)