VulnSocial

CVE-2021-35036PoC(zyxel / ax7501-b0)

LOWCVSS 6.5 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

A cleartext storage of information vulnerability in the Zyxel VMG3625-T50B firmware version V5.50(ABTL.0)b2k could allow an authenticated attacker to obtain sensitive information from the configuration file.

zyxel CVEsBack to dashboard
2.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-312

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • ax7501-b0
  • ax7501-b0_firmware
  • dx3301-t0
  • dx3301-t0_firmware

Threat summary

  • Public PoC is present in monitored signal
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • PoC mentioned or linked in 2 signals
  • Technical details provided in 2 signals
  • Peaked 1d ago at 1 mentions (2026-05-22); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
zyxel
Products
ax7501-b0ax7501-b0_firmwaredx3301-t0dx3301-t0_firmwaredx5401-b0dx5401-b0_firmwareemg3525-t50bemg3525-t50b_firmwareemg5523-t50bemg5523-t50b_firmware

1 version affected across 62 products

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-05-22: 1Mentions · 2026-05-23: 1PoC Mentioned / Linked · 2026-05-22: 1PoC Mentioned / Linked · 2026-05-23: 1Technical Details · 2026-05-22: 1Technical Details · 2026-05-23: 105-2205-23
Signal classification1 categories
PoC
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • Nicolas Krassas@Dinosn
    PoC

    Zyxel super-admin credential leak expanded from one router image to CPE/ONT/LTE/5G devices + password gen algorithm. https://minanagehsalalma.github.io/zyxel-cve-2021-35036-super-admin-password-leak/?1

    Post summary

    The text discusses CVE-2021-35036, detailing a super-admin credential leak in Zyxel devices with a link to a technical analysis or PoC. It emphasizes the expansion of the vulnerability to multiple device types and provides specific technical details.

    1301893.5K
    158.6K followersView on X
  • Nicolas Krassas@Dinosn
    PoC

    Zyxel low-priv account leaked super-admin, FTPS, and TR-069 secrets across router fleets https://minanagehsalalma.github.io/zyxel-cve-2021-35036-super-admin-password-leak/

    Post summary

    The tweet discloses CVE-2021-35036 in Zyxel routers, describing how a low-privilege account leaks super-admin, FTPS, and TR-069 secrets, and shares a link to a detailed technical write-up/PoC.

    000541.3K
    158.6K followersView on X
CPE platform detail64 entries

64 of 64 entries

PartVendorProductVersionTarget SWTarget HW
HWzyxelax7501-b0---
OSzyxelax7501-b0_firmware---
HWzyxeldx3301-t0---
OSzyxeldx3301-t0_firmware---
HWzyxeldx5401-b0---
OSzyxeldx5401-b0_firmware---
HWzyxelemg3525-t50b---
OSzyxelemg3525-t50b_firmware---
HWzyxelemg5523-t50b---
OSzyxelemg5523-t50b_firmware---
HWzyxelemg5723-t50k---
OSzyxelemg5723-t50k_firmware---
HWzyxelep240p---
OSzyxelep240p_firmware---
HWzyxelex5401-b0---
OSzyxelex5401-b0_firmware---
HWzyxelex5501-b0---
OSzyxelex5501-b0_firmware---
HWzyxellte3301-plus---
OSzyxellte3301-plus_firmware---
HWzyxellte5388-m804---
OSzyxellte5388-m804_firmware---
HWzyxellte5388-s905---
OSzyxellte5388-s905_firmware---
HWzyxellte5398-m904---
OSzyxellte5398-m904_firmware---
HWzyxellte7240-m403---
OSzyxellte7240-m403_firmware---
HWzyxellte7461-m602---
OSzyxellte7461-m602_firmware---
HWzyxellte7480-m804---
OSzyxellte7480-m804_firmware---
HWzyxellte7480-s905---
OSzyxellte7480-s905_firmware---
HWzyxellte7485-s905---
OSzyxellte7485-s905_firmware---
HWzyxellte7490-m804---
OSzyxellte7490-m804_firmware---
HWzyxelnr5101---
OSzyxelnr5101_firmware---
HWzyxelnr7101---
OSzyxelnr7101_firmware---
HWzyxelnr7102---
OSzyxelnr7102_firmware---
HWzyxelpm7300-t0---
OSzyxelpm7300-t0_firmware---
HWzyxelpmg5317-t20b---
OSzyxelpmg5317-t20b_firmware---
HWzyxelpmg5617-t20b2---
OSzyxelpmg5617-t20b2_firmware---
HWzyxelpmg5617ga---
OSzyxelpmg5617ga_firmware---
HWzyxelpmg5622ga---
OSzyxelpmg5622ga_firmware---
HWzyxelvmg3625-t50b---
OSzyxelvmg3625-t50b_firmware---
OSzyxelvmg3625-t50b_firmware---
OSzyxelvmg3625-t50b_firmware---
HWzyxelvmg3927-t50k---
OSzyxelvmg3927-t50k_firmware---
HWzyxelvmg8623-t50b---
OSzyxelvmg8623-t50b_firmware---
HWzyxelvmg8825-t50k---
OSzyxelvmg8825-t50k_firmware---

Explore more

Back to dashboardzyxel CVEsax7501-b0 vulnerabilities