CVE-2023-20107Network attack vector

Private-key recovery via low-entropy key generation

Published Mar 23, 2023 · Updated Oct 28, 2024

Insufficient entropy in Cisco Adaptive Security Appliance Software before 9.12.1 allows unauthenticated remote attackers to recover private keys. The deterministic random bit generator supplies too little entropy when affected ASA 5506-X-family, 5508-X, or 5516-X hardware generates ECDSA or RSA keys, allowing collisions across a large key sample. The condition persists for keys generated on an affected release, and recovered keys enable traffic decryption or device impersonation.

CVSS severity5.3
Medium
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient entropy in Cisco Adaptive Security Appliance Software before 9.12.1 allows unauthenticated remote attackers to recover private keys. The deterministic random bit generator supplies too little entropy when affected ASA 5506-X-family, 5508-X, or 5516-X hardware generates ECDSA or RSA keys, allowing collisions across a large key sample. The condition persists for keys generated on an affected release, and recovered keys enable traffic decryption or device impersonation.

The record

CVE
CVE-2023-20107
Published
Mar 23, 2023
Updated
Oct 28, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-331, CWE-332
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=n/a

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.3Cisco Systems, Inc.CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:X/RC:X

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-331Insufficient Entropy
CWE-332Insufficient Entropy in PRNG

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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