CVE-2019-19196Public exploit

Device crash via oversized BLE pairing key

Published Feb 12, 2020 · Updated Aug 5, 2024

Buffer overflow in the SMP implementation in Telink Semiconductor BLE SDKs before November 2019 allows physically proximate attackers to crash devices. The peripheral accepts a pairing key size above the 16-byte limit, permits link-layer encryption before pairing completes, and allocates the negotiated oversized key buffer. Pairing support must be enabled, and affected releases include TLSR8x5x 3.4.0 and earlier, TLSR823x 1.3.0 and earlier, and TLSR826x 3.3 and earlier; exploitation corrupts device memory and crashes the peripheral.

CVSS severity6.5
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the SMP implementation in Telink Semiconductor BLE SDKs before November 2019 allows physically proximate attackers to crash devices. The peripheral accepts a pairing key size above the 16-byte limit, permits link-layer encryption before pairing completes, and allocates the negotiated oversized key buffer. Pairing support must be enabled, and affected releases include TLSR8x5x 3.4.0 and earlier, TLSR823x 1.3.0 and earlier, and TLSR826x 3.3 and earlier; exploitation corrupts device memory and crashes the peripheral.

The record

CVE
CVE-2019-19196
Published
Feb 12, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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