What is CVE-2019-13916?

CVE-2019-13916 is a high-severity vulnerability in Cypress Cyw20735b1, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-04-13.

How severe is CVE-2019-13916?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2019-13916 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Cypress Cyw20735b1

CVE-2019-13916

An issue was discovered in Cypress (formerly Broadcom) WICED Studio 6.2 CYW20735B1 and CYW20819A1. As a Bluetooth Low Energy (BLE) packet is received, it is copied into a Heap (ThreadX Block) buffer. The buffer allocated in dhmulp_getRxBuffer is four bytes too small to hold the maximum of 255 bytes plus headers. It is possible to corrupt a pointer in the linked list holding the free buffers of the g_mm_BLEDeviceToHostPool Block pool. This pointer can be fully controlled by overflowing with 3 bytes of packet data and the first byte of the packet CRC checksum. The checksum can be freely chosen by adapting the packet data accordingly. An attacker might be able to allocate the overwritten address as a receive buffer resulting in a write-what-where condition. This is fixed in BT SDK2.4 and BT SDK2.45.

Vulnerability class: Buffer Overflow

Published 2020-04-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

seemoo-lab/frankenstein

References

community.cypress.com/thread/53681 (Permissions Required, Vendor Advisory)
github.com/seemoo-lab/frankenstein/blob/master/doc/CVE_2019_13916.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-13916?: CVE-2019-13916 is a high-severity vulnerability in Cypress Cyw20735b1, classified under Out-of-bounds Write. CVSS score: 8.8/10. Published 2020-04-13.
How severe is CVE-2019-13916?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2019-13916 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.