CVE-2019-10808Public exploit

Prototype pollution via unsafe recursive merge

Published Mar 11, 2020 · Updated Aug 4, 2024

Prototype pollution in XCritical Software utilitify before 1.0.3 allows attackers to modify Object.prototype through crafted merge input. The mergeDeep function recursively copies enumerable keys without excluding proto, constructor, or prototype, allowing those keys to reach prototype objects. Exploitation requires a consuming application to pass attacker-controlled object keys into mergeDeep; polluted inherited properties can then alter application behavior.

CVSS severity8.8
High
EPSS probability2.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in XCritical Software utilitify before 1.0.3 allows attackers to modify Object.prototype through crafted merge input. The mergeDeep function recursively copies enumerable keys without excluding proto, constructor, or prototype, allowing those keys to reach prototype objects. Exploitation requires a consuming application to pass attacker-controlled object keys into mergeDeep; polluted inherited properties can then alter application behavior.

The record

CVE
CVE-2019-10808
Published
Mar 11, 2020
Updated
Aug 4, 2024
Vendor
XCritical Software
Product
utilitify
Classifications
CWE-1321
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 11, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions prior to 1.0.3

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

XCritical Software · utilitifyversion=All versions prior to 1.0.3

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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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