CVE-2009-5139Public exploitNetwork attack vector

Password recovery via forged SIP authentication challenge

Published Feb 12, 2020 · Updated Aug 7, 2024

Credential exposure in Gizmo5's SIP implementation allows remote attackers to recover passwords through an offline brute-force attack. After an outbound BYE, the client accepts an attacker-supplied 407 challenge and returns a second BYE containing a Digest response derived from the password. The attacker must make the phone ring and induce the user to answer and hang up; possession of the response enables offline password guessing and subsequent account access.

CVSS severity7.5
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential exposure in Gizmo5's SIP implementation allows remote attackers to recover passwords through an offline brute-force attack. After an outbound BYE, the client accepts an attacker-supplied 407 challenge and returns a second BYE containing a Digest response derived from the password. The attacker must make the phone ring and induce the user to answer and hang up; possession of the response enables offline password guessing and subsequent account access.

The record

CVE
CVE-2009-5139
Published
Feb 12, 2020
Updated
Aug 7, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-916, T1110.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2024Record 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

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
7.5NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/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.

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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-916Use of Password Hash With Insufficient Computational Effort
T1110.002Password Cracking

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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