CVE-2023-39914Network attack vector

Application crash via unchecked ASN.1 structural fields

Published Sep 13, 2023 · Updated Sep 12, 2024

Denial of service in NLnet Labs bcder before 0.7.3 allows remote attackers to crash consuming applications via malformed ASN.1 data. Unchecked nested lengths, truncated primitive or tag content, invalid bit-string padding, and malformed object identifiers reach panic paths instead of errors. Exploitation requires a consuming application to decode attacker-controlled BER, CER, or DER input and interrupts only that process.

CVSS severity7.5
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in NLnet Labs bcder before 0.7.3 allows remote attackers to crash consuming applications via malformed ASN.1 data. Unchecked nested lengths, truncated primitive or tag content, invalid bit-string padding, and malformed object identifiers reach panic paths instead of errors. Exploitation requires a consuming application to decode attacker-controlled BER, CER, or DER input and interrupts only that process.

The record

CVE
CVE-2023-39914
Published
Sep 13, 2023
Updated
Sep 12, 2024
Vendor
NLnet Labs
Product
bcder
Classifications
CWE-232, CWE-240, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 13, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=* <0.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NLnet Labs · bcderversion=* <0.7.3

Published CVSS scores

7.5NLnet LabsCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-232Improper Handling of Undefined Values
CWE-240Improper Handling of Inconsistent Structural Elements
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo