CVE-2023-4043Public exploitNetwork attack vector

Service interruption via unchecked negative number scale

Published Nov 3, 2023 · Updated Sep 5, 2024

Improper input validation in Eclipse Parsson before 1.0.5 and 1.1.0 through 1.1.3 allows remote attackers to interrupt service via crafted JSON numbers. JsonNumberImpl.bigIntegerValue() and bigIntegerValueExact() compared only signed BigDecimal scales to the limit, so a huge negative scale bypassed the guard and drove costly BigInteger conversion. Reachability requires an application to pass attacker-controlled JSON numeric content to a BigInteger conversion; the bounded consequence is excessive resource consumption that interrupts service.

CVSS severity5.9
Medium
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Eclipse Parsson before 1.0.5 and 1.1.0 through 1.1.3 allows remote attackers to interrupt service via crafted JSON numbers. JsonNumberImpl.bigIntegerValue() and bigIntegerValueExact() compared only signed BigDecimal scales to the limit, so a huge negative scale bypassed the guard and drove costly BigInteger conversion. Reachability requires an application to pass attacker-controlled JSON numeric content to a BigInteger conversion; the bounded consequence is excessive resource consumption that interrupts service.

The record

CVE
CVE-2023-4043
Published
Nov 3, 2023
Updated
Sep 5, 2024
Vendor
The Eclipse Foundation
Product
Eclipse Parsson
Classifications
CWE-834, CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 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=0 <1.0.5
  2. Affected versionversion=1.1.0 <1.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Parssonversion=0 <1.0.5; version=1.1.0 <1.1.4

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.9GitHubCVSS:3.1/AV:N/AC:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-834Excessive Iteration
CWE-20Improper Input Validation
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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