CVE-2021-45462Network attack vector

Service crash via undersized GTP-U packet

Published Dec 23, 2021 · Updated Aug 4, 2024

Denial of service in Open5GS SGW-U and UPF 2.4.0 allows remote attackers using a UE to crash either service with a crafted GTP-U packet. The GTPv1-U receive callbacks trust the header-indicated length and call ogs_pkbuf_pull even when the packet buffer is no larger than that length, triggering an assertion instead of dropping the undersized packet. The attacker needs UE access to the mobile core's GTP-U path; exploitation interrupts user-plane forwarding but does not expose or modify data.

CVSS severity7.5
High
EPSS probability4.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Open5GS SGW-U and UPF 2.4.0 allows remote attackers using a UE to crash either service with a crafted GTP-U packet. The GTPv1-U receive callbacks trust the header-indicated length and call ogs_pkbuf_pull even when the packet buffer is no larger than that length, triggering an assertion instead of dropping the undersized packet. The attacker needs UE access to the mobile core's GTP-U path; exploitation interrupts user-plane forwarding but does not expose or modify data.

The record

CVE
CVE-2021-45462
Published
Dec 23, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1284, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 23, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo