CVE-2024-42483

Packet replay via shared message cache

Published Sep 12, 2024 · Updated Sep 12, 2024

Replay protection failure in Espressif Systems ESP-NOW 2.5.1 and earlier allows physically proximate attackers to re-inject captured packets. In espnow_recv_cb, one g_msg_magic_cache records plaintext and ciphertext message identifiers, so plaintext traffic can evict ciphertext entries. An attacker within Wi-Fi range can fill that shared cache and replay an older ciphertext packet, altering the data accepted by a receiving device.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Replay protection failure in Espressif Systems ESP-NOW 2.5.1 and earlier allows physically proximate attackers to re-inject captured packets. In espnow_recv_cb, one g_msg_magic_cache records plaintext and ciphertext message identifiers, so plaintext traffic can evict ciphertext entries. An attacker within Wi-Fi range can fill that shared cache and replay an older ciphertext packet, altering the data accepted by a receiving device.

The record

CVE
CVE-2024-42483
Published
Sep 12, 2024
Updated
Sep 12, 2024
Vendor
Espressif Systems
Product
ESP-NOW
Classifications
CWE-345, CWE-349, T1565.002
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.5.2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Espressif Systems · ESP-NOWversion=< 2.5.2

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-349Acceptance of Extraneous Untrusted Data With Trusted Data
T1565.002Transmitted Data Manipulation

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo