CVE-2026-7183Network attack vector

Remote service crash via unchecked PDU length

Published Apr 27, 2026 · Updated Apr 27, 2026

Uncaught exception handling in UERANSIM 3.2.0 through 3.2.7 allows remote attackers to crash a UE or gNodeB with a malformed RLS packet. DecodeRlsMessage trusts the packet pduLength and calls readOctetString without first verifying that the declared payload remains in the input buffer. Network access to the simulated RLS UDP endpoint is sufficient; an out-of-bounds read request throws an unhandled exception and interrupts the affected process.

CVSS severity5.3
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception handling in UERANSIM 3.2.0 through 3.2.7 allows remote attackers to crash a UE or gNodeB with a malformed RLS packet. DecodeRlsMessage trusts the packet pduLength and calls readOctetString without first verifying that the declared payload remains in the input buffer. Network access to the simulated RLS UDP endpoint is sufficient; an out-of-bounds read request throws an unhandled exception and interrupts the affected process.

The record

CVE
CVE-2026-7183
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
Ali Güngör
Product
UERANSIM
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 2026Record 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=3.2.0
  2. Affected versionversion=3.2.1
  3. Affected versionversion=3.2.2
  4. Affected versionversion=3.2.3
  5. Affected versionversion=3.2.4
  6. Affected versionversion=3.2.5
  7. Affected versionversion=3.2.6
  8. Affected versionversion=3.2.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ali Güngör · UERANSIMversion=3.2.0; version=3.2.1; version=3.2.2; version=3.2.3; version=3.2.4; version=3.2.5; version=3.2.6; version=3.2.7

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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