CyberSecBulletin
CVE-2025-27891NVD status: Analyzed

Exynos 980 Firmware: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2025-27891 is a critical-severity out-of-bounds read vulnerability in Exynos 980 Firmware from Samsung, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.48% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of Exynos 980 Firmware you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on semiconductor.samsung.com for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
SamsungExynos 980 FirmwareNot specified in the recordNot stated
SamsungExynos 990 FirmwareNot specified in the recordNot stated
SamsungExynos 850 FirmwareNot specified in the recordNot stated
SamsungExynos 1080 FirmwareNot specified in the recordNot stated
SamsungExynos 2100 FirmwareNot specified in the recordNot stated
SamsungExynos 1280 FirmwareNot specified in the recordNot stated
SamsungExynos 2200 FirmwareNot specified in the recordNot stated
SamsungExynos 1330 FirmwareNot specified in the recordNot stated
SamsungExynos 1380 FirmwareNot specified in the recordNot stated
SamsungExynos 1480 FirmwareNot specified in the recordNot stated
SamsungExynos 2400 FirmwareNot specified in the recordNot stated
SamsungExynos W920 FirmwareNot specified in the recordNot stated
SamsungExynos W930 FirmwareNot specified in the recordNot stated
SamsungExynos W1000 FirmwareNot specified in the recordNot stated
SamsungExynos Modem 5123 FirmwareNot specified in the recordNot stated
SamsungExynos Modem 5300 FirmwareNot specified in the recordNot stated
SamsungExynos Modem 5400 FirmwareNot specified in the recordNot stated

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. Scored by CISA (ADP).

Official description

An issue was discovered in Samsung Mobile Processor, Wearable Processor, and Modem Exynos 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, W920, W930, W1000, Modem 5123, Modem 5300, Modem 5400. The lack of a length check leads to out-of-bounds reads via malformed NAS packets.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Exynos 980 Firmware

All Exynos 980 Firmware vulnerabilities

Recent Out-of-bounds Read vulnerabilities

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