CVE-2024-55539

Package integrity bypass via weak RPM signing

Published Dec 23, 2024 · Updated Jun 4, 2025

Weak RPM signing in Acronis Cyber Protect 16 before build 39938 and Cloud Agent before build 39185 allows local users to modify packages. Acronis has not disclosed the signing algorithm or the verification path that accepts packages whose authenticity should be rejected. Exploitation requires local low-privileged access and high-complexity conditions; the published impact is limited to package integrity.

CVSS severity2.5
Low
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak RPM signing in Acronis Cyber Protect 16 before build 39938 and Cloud Agent before build 39185 allows local users to modify packages. Acronis has not disclosed the signing algorithm or the verification path that accepts packages whose authenticity should be rejected. Exploitation requires local low-privileged access and high-complexity conditions; the published impact is limited to package integrity.

The record

CVE
CVE-2024-55539
Published
Dec 23, 2024
Updated
Jun 4, 2025
Vendor
Acronis
Product
Acronis Cyber Protect
Classifications
CWE-327, T1553.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <39938

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Acronis · Acronis Cyber Protectversion=unspecified <39938
Acronis · Acronis Cyber Protect Cloud Agentversion=unspecified <39185

Published CVSS scores

2.5Acronis International GmbHCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1553.002Code Signing

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

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Your stack

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