CVE-2026-45084Public exploitNetwork attack vector

Service crash via unchecked Content-Type parsing state

Published Aug 4, 2026 · Updated Aug 4, 2026

NULL pointer dereference in OpenSIPS 3.4.0 through 3.6.5 and 4.0.0-beta allows remote attackers to crash the SIP service. When presence.handle_publish() handles a PUBLISH body with Event: presence and enable_sphere_check=1, it calls get_content_type() before parse_content_type_hdr(), dereferencing NULL header state. UDP or TCP reachability to that route is required; the vulnerable path has no authentication check, although deployment routing can impose one.

CVSS severity8.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in OpenSIPS 3.4.0 through 3.6.5 and 4.0.0-beta allows remote attackers to crash the SIP service. When presence.handle_publish() handles a PUBLISH body with Event: presence and enable_sphere_check=1, it calls get_content_type() before parse_content_type_hdr(), dereferencing NULL header state. UDP or TCP reachability to that route is required; the vulnerable path has no authentication check, although deployment routing can impose one.

The record

CVE
CVE-2026-45084
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
OpenSIPS
Product
OpenSIPS
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=>= 3.4.0, < 3.6.6
  2. Affected versionversion=>= 4.0.0-beta, < 4.0.0-rc1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSIPS · OpenSIPSversion=>= 3.4.0, < 3.6.6; version=>= 4.0.0-beta, < 4.0.0-rc1

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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 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 exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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