CVE-2023-33613Public exploit

Process crash via unchecked private-key length

Published Jun 6, 2023 · Updated Jan 8, 2025

Heap buffer overflow in axTLS 2.1.5 private-key parsing allows local users to crash the hosting process with a crafted private key. asn1_get_private_key passes unchecked values from asn1_get_big_int to RSA_priv_key_new, allowing bi_import to read beyond a heap allocation when the data and length disagree. Exploitation requires the target application to load an attacker-supplied private key, and the demonstrated consequence is process termination.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in axTLS 2.1.5 private-key parsing allows local users to crash the hosting process with a crafted private key. asn1_get_private_key passes unchecked values from asn1_get_big_int to RSA_priv_key_new, allowing bi_import to read beyond a heap allocation when the data and length disagree. Exploitation requires the target application to load an attacker-supplied private key, and the demonstrated consequence is process termination.

The record

CVE
CVE-2023-33613
Published
Jun 6, 2023
Updated
Jan 8, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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