CVE-2026-90778Network attack vector

Unauthenticated crash via oversized SIP To tag

Published Sep 13, 2026 · Updated Sep 13, 2026

Buffer overflow in SIPp through 3.7.7 allows remote attackers to crash the process via SIP To headers with oversized tag parameters. The get_peer_tag() function copies tag values of at least 2049 bytes into a fixed static buffer without sufficient bounds enforcement. The unauthenticated network path requires only a crafted SIP message and results in process termination, with no supported evidence of data disclosure or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in SIPp through 3.7.7 allows remote attackers to crash the process via SIP To headers with oversized tag parameters. The get_peer_tag() function copies tag values of at least 2049 bytes into a fixed static buffer without sufficient bounds enforcement. The unauthenticated network path requires only a crafted SIP message and results in process termination, with no supported evidence of data disclosure or code execution.

The record

CVE
CVE-2026-90778
Published
Sep 13, 2026
Updated
Sep 13, 2026
Vendor
SIPp
Product
SIPp
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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=0 <=3.7.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SIPp · SIPpversion=0 <=3.7.7

Published CVSS scores

No CVSS assessment is available in this record.

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

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

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Your stack

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