CVE-2023-2650Network attack vector

Service interruption via quadratic object identifier conversion

Published May 30, 2023 · Updated Mar 19, 2025

Algorithmic complexity in affected OpenSSL releases allows remote attackers to interrupt services via oversized ASN.1 object identifiers. OBJ_obj2txt converts an unbounded, attacker-controlled sub-identifier to decimal text with quadratic time complexity. Exposure requires direct processing of untrusted data or an affected subsystem without a message-size limit; TLS chiefly exposes clients and servers using client authentication.

CVSS severity6.5
Medium
EPSS probability75.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Algorithmic complexity in affected OpenSSL releases allows remote attackers to interrupt services via oversized ASN.1 object identifiers. OBJ_obj2txt converts an unbounded, attacker-controlled sub-identifier to decimal text with quadratic time complexity. Exposure requires direct processing of untrusted data or an affected subsystem without a message-size limit; TLS chiefly exposes clients and servers using client authentication.

The record

CVE
CVE-2023-2650
Published
May 30, 2023
Updated
Mar 19, 2025
Vendor
OpenSSL Project
Product
OpenSSL
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 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?

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

  1. Affected versionversion=1.0.2 <1.0.2zh
  2. Affected versionversion=1.1.1 <1.1.1u
  3. Affected versionversion=3.0.0 <3.0.9
  4. Affected versionversion=3.1.1 <3.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenSSL Project · OpenSSLversion=1.0.2 <1.0.2zh; version=1.1.1 <1.1.1u; version=3.0.0 <3.0.9; version=3.1.1 <3.1.1

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/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.

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-400Uncontrolled Resource Consumption
T1499.003Endpoint Denial of Service: Application Exhaustion Flood

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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