CVE-2019-19194Public exploit

Protected GATT access via zero-LTK session

Published Feb 12, 2020 · Updated Aug 5, 2024

Authentication bypass in Telink Semiconductor BLE SDKs before November 2019 allows physically proximate attackers to read or write protected GATT data. During Secure Connections pairing, the peripheral accepts an out-of-order link-layer encryption request without validating that pairing completed, then derives the session key from a zero-initialized LTK. Radio range and Secure Connections support are required; affected TLSR8x5x, TLSR823x, and TLSR826x implementations also allow a device crash.

CVSS severity8.8
High
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Telink Semiconductor BLE SDKs before November 2019 allows physically proximate attackers to read or write protected GATT data. During Secure Connections pairing, the peripheral accepts an out-of-order link-layer encryption request without validating that pairing completed, then derives the session key from a zero-initialized LTK. Radio range and Secure Connections support are required; affected TLSR8x5x, TLSR823x, and TLSR826x implementations also allow a device crash.

The record

CVE
CVE-2019-19194
Published
Feb 12, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
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

8.8NIST NVDCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.8NIST NVDAV:A/AC:L/Au:N/C:P/I:P/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

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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