CVE-2026-38577-by-deepak-Anmol

CVE-2026-38577 — Tenda HG21 Hardcoded Root Credentials Summary Field| Value ---|--- CVE ID| CVE-2026-38577 Vendor| Tenda Product| Tenda HG21 XPON Fiber Modem Affected Version| V4.0.0-260302 Product Key| HG21-V1.0-TDE01 Hardware Version| V1.0 Firmware Build Date| 2026-03-02 Firmware File|...

Tenda HG21 Hardcoded Root Credentials

Firmware analysis of the Tenda HG21 XPON fiber modem revealed a hardcoded administrative account baked into the shipped firmware image. The account is granted full root privileges UID 0 and its credentials are static across devices, meaning any attacker who can reach an exposed management service...

PUB-A-457429887

In Cellular Modem, there is a possible out-of-bounds write due to a heap buffer overflow. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-474600296

In Cellular Modem, there is a possible out-of-bounds write due to a missing bounds check. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-484011314

In Cellular Modem, there is a possible permission bypass due to a logic error in the code. This could lead to remote proximal/adjacent escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-490004786

In Cellular Modem, there is a possible out-of-bounds write due to a heap buffer overflow. This could lead to remote proximal/adjacent code execution with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-497884669

In Cellular Modem, there is a possible denial of service due to improper input validation. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-490030190

In Cellular Modem, there is a possible denial of service due to improper input validation. This could lead to remote proximal/adjacent denial of service with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-467351933

In Cellular Modem, there is a possible information disclosure due to improper input validation. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-463368136

In Modem, there is a possible information disclosure due to improper input validation. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-463366627

In Cellular Modem, there is a possible information disclosure due to a logic error in the code. This could lead to remote code execution with no additional execution privileges needed. User interaction is not needed for exploitation...

PUB-A-507435428

Bulletin has no description...

SUSE CVE-2026-72029

In the Linux kernel, the following vulnerability has been resolved: net: wwan: iosm: bound device offsets in the MUX downlink decoder muxdladbdecode walks a chain of aggregated datagram tables using offsets and lengths taken from the modem. firsttableindex, nexttableindex, tablelength,...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: net: ipa: Hash tables are only reset when supported. Last year, the code that manages GSI channel transactions switched from using spinlock-protected linked lists to using indexes in the ring buffer used for a channel. Recently,...

CVE-2026-12520

The Sierra Wireless HL7800 cellular modem driver drivers/modem/vendorstandalone/hl7800.c, located at drivers/modem/hl7800.c in v4.4.0 and earlier parses AT responses with roughly twenty handlers that call netbuflinearizevalue, sizeofvalue, buf, 0, len into a 128-byte stack buffer and then write...

CVE-2026-12520 Stack buffer overflow and off-by-one writes in Zephyr HL7800 modem AT response handlers

The Sierra Wireless HL7800 cellular modem driver drivers/modem/vendorstandalone/hl7800.c, located at drivers/modem/hl7800.c in v4.4.0 and earlier parses AT responses with roughly twenty handlers that call netbuflinearizevalue, sizeofvalue, buf, 0, len into a 128-byte stack buffer and then write...

PT-2026-77289

The Sierra Wireless HL7800 cellular modem driver drivers/modem/vendor standalone/hl7800.c, located at drivers/modem/hl7800.c in v4.4.0 and earlier parses AT responses with roughly twenty handlers that call net buf linearizevalue, sizeofvalue, buf, 0, len into a 128-byte stack buffer and then writ...

CVE-2026-12519

The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV: events in oncmdsocknotifyev drivers/modem/vendorstandalone/wncm14a2a.c. The response line is linearized into a fixed 40-byte stack buffer via netbuflinearize, which caps the copy at 39 bytes and returns outlen = 39. The two...

EUVD-2026-60269

The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV: events in oncmdsocknotifyev drivers/modem/vendorstandalone/wncm14a2a.c. The response line is linearized into a fixed 40-byte stack buffer via netbuflinearize, which caps the copy at 39 bytes and returns outlen = 39. The two...

CVE-2026-12519 Out-of-bounds stack read and write in Zephyr WNC-M14A2A modem socket-notify parsing

The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV: events in oncmdsocknotifyev drivers/modem/vendorstandalone/wncm14a2a.c. The response line is linearized into a fixed 40-byte stack buffer via netbuflinearize, which caps the copy at 39 bytes and returns outlen = 39. The two...