CVE-2024-45751Network attack vector

Authentication bypass via predictable CHAP challenges

Published Sep 6, 2024 · Updated Nov 30, 2024

CHAP authentication bypass in tgt before 1.0.93 allows remote attackers to gain an iSCSI user's privileges through response replay. The chap_initiator_auth_create_challenge function uses rand() without calling srand(), so each process restart repeats the same challenge sequence. Exploitation requires monitoring a valid initiator exchange and waiting for the target daemon or service to restart; the replay grants that iSCSI user's privileges.

CVSS severity5.9
Medium
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CHAP authentication bypass in tgt before 1.0.93 allows remote attackers to gain an iSCSI user's privileges through response replay. The chap_initiator_auth_create_challenge function uses rand() without calling srand(), so each process restart repeats the same challenge sequence. Exploitation requires monitoring a valid initiator exchange and waiting for the target daemon or service to restart; the replay grants that iSCSI user's privileges.

The record

CVE
CVE-2024-45751
Published
Sep 6, 2024
Updated
Nov 30, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-338, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 30, 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

5.9CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1040Network Sniffing

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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