CVE-2022-47517Public exploitNetwork attack vector

Daemon crash via truncated percent escape

Published Dec 18, 2022 · Updated Apr 17, 2025

Heap-based buffer over-read in drachtio-server before 0.8.19 allows remote attackers to crash the daemon with a crafted UDP message. The bundled libsofia-sip url_canonize2 parser reads one byte beyond the heap buffer when a SIP Contact header ends with an incomplete percent escape. No authentication or user interaction is required; a UDP datagram sent to the exposed SIP listener interrupts call-processing service by terminating the daemon.

CVSS severity7.5
High
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer over-read in drachtio-server before 0.8.19 allows remote attackers to crash the daemon with a crafted UDP message. The bundled libsofia-sip url_canonize2 parser reads one byte beyond the heap buffer when a SIP Contact header ends with an incomplete percent escape. No authentication or user interaction is required; a UDP datagram sent to the exposed SIP listener interrupts call-processing service by terminating the daemon.

The record

CVE
CVE-2022-47517
Published
Dec 18, 2022
Updated
Apr 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-193, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
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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