dbcve.org
ExynosHardware / appliance · Samsung

CVE-2020-25054

CRITICAL · 9.1 CVSS v3.1 Published 2020-08-31
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An issue was discovered on Samsung mobile devices with software through 2020-04-02 (Exynos modem chipsets). There is a heap-based buffer over-read in the Shannon baseband. The Samsung ID is SVE-2020-17239 (August 2020).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Heap-based buffer over-read vulnerability in the Shannon baseband processor of Samsung mobile devices using Exynos modem chipsets. This memory corruption flaw in baseband firmware could allow remote attackers to potentially execute arbitrary code or cause denial of service by reading beyond allocated heap memory boundaries.

MitigationApply Samsung's security update SVE-2020-17239 (August 2020) to patch the vulnerable baseband firmware on affected Exynos chipset devices.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
ExynosHardware / appliance
Affected:all versions

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify the device chipset
    Check the device Settings > About Phone > Chipset/Processor information, or use a system information app to determine if the device uses an Exynos processor
    Affected if The device uses an Exynos chipset from Samsung (Shannon baseband modem)
  2. Check the baseband/modem firmware version
    Navigate to Settings > About Phone > Software information > Baseband version, or dial *#1234# to view the baseband version on Samsung devices
    Affected if The baseband version predates the SVE-2020-17239 patch release (August 2020)
  3. Verify the Android security patch level
    Check Settings > About Phone > Software information > Security patch level. This displays the date of the most recent security update
    Affected if The security patch level is earlier than August 2020, indicating the SVE-2020-17239 fix has not been applied

The device is affected if it uses an Exynos chipset with Shannon baseband processor and has not received the August 2020 security update (SVE-2020-17239) that patches this vulnerability.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply Samsung's security update SVE-2020-17239 (August 2020) to patch the vulnerable baseband firmware on affected Exynos chipset devices.

Fix this in Exynos Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-25054 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data