CVE-2023-38909Public exploit

Information disclosure via fixed AES-CBC initialization vectors

Published Aug 22, 2023 · Updated Aug 2, 2024

Information disclosure in TP-Link Tapo L530, L510E, L630, P100, and app 2.8.14 allows nearby attackers to infer local commands. The local Bulb-App protocol reuses one AES-128-CBC initialization vector for the entire session-key lifetime, so equal plaintext messages produce equal ciphertext and expose recognizable device actions. Exploitation requires Wi-Fi proximity and user-generated traffic on L530 before 1.2.4, L510E before 1.1.0, L630 before 1.0.4, P100 before 1.5.0, or app 2.8.14.

CVSS severity6.5
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in TP-Link Tapo L530, L510E, L630, P100, and app 2.8.14 allows nearby attackers to infer local commands. The local Bulb-App protocol reuses one AES-128-CBC initialization vector for the entire session-key lifetime, so equal plaintext messages produce equal ciphertext and expose recognizable device actions. Exploitation requires Wi-Fi proximity and user-generated traffic on L530 before 1.2.4, L510E before 1.1.0, L630 before 1.0.4, P100 before 1.5.0, or app 2.8.14.

The record

CVE
CVE-2023-38909
Published
Aug 22, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-329, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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

6.5NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.6SECRYPT 2023 paperCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-329Generation of Predictable IV with CBC Mode
T1040Network Sniffing

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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