CVE-2023-51257Public exploit

Local code execution via zero-length ICC text

Published Jan 16, 2024 · Updated Nov 4, 2025

Invalid memory write in JasPer 4.1.1 and earlier allows local users to execute arbitrary code by processing a crafted JP2 image. The jas_icctxt_input function allocates an ICC text buffer from an attacker-controlled count, then writes a terminator at count minus one without rejecting a zero count. A local user must cause JasPer or a linked application to decode the crafted file; code runs in the decoding process's security context.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid memory write in JasPer 4.1.1 and earlier allows local users to execute arbitrary code by processing a crafted JP2 image. The jas_icctxt_input function allocates an ICC text buffer from an attacker-controlled count, then writes a terminator at count minus one without rejecting a zero count. A local user must cause JasPer or a linked application to decode the crafted file; code runs in the decoding process's security context.

The record

CVE
CVE-2023-51257
Published
Jan 16, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1203Exploitation for Client Execution

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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