CVE-2023-26076Network attack vector

Memory corruption via unvalidated 5G reserved options

Published Mar 13, 2023 · Updated Mar 3, 2025

Intra-object overflow in Samsung Exynos chipsets allows attackers to corrupt modem memory through crafted 5G SM reserved options. The NrSmPcoCodec decoder processes the Extended protocol configuration options information element without sufficient parameter validation, permitting data to overrun an object boundary. Exploitation requires either a malicious mobile network operator or local access to an affected device; public sources do not establish code execution or a specific crash outcome.

CVSS severity9.8
Critical
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Intra-object overflow in Samsung Exynos chipsets allows attackers to corrupt modem memory through crafted 5G SM reserved options. The NrSmPcoCodec decoder processes the Extended protocol configuration options information element without sufficient parameter validation, permitting data to overrun an object boundary. Exploitation requires either a malicious mobile network operator or local access to an affected device; public sources do not establish code execution or a specific crash outcome.

The record

CVE
CVE-2023-26076
Published
Mar 13, 2023
Updated
Mar 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.6MITRECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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