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CVE-2021-23509

29
FAUCET Score

CVE-2021-23509 is a critical type confusion vulnerability in the json-ptr package prior to version 3.0.0, allowing for a bypass of CVE-2020-7766 when user-provided keys in the pointer parameter are arrays. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.0.0CPE matchmatch criteria
cpe:2.3:a:json-ptr_project:json-ptr:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.6MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.2
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.77%
Probability of exploitation in next 30 days
EPSS Percentile
75.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0177 is in the 64th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: json-ptrFixed in: 3.0.0

Vendor Advisories (1)

npmGHSA-8gwj-8hxc-285wmedium

Prototype Pollution in json-ptr

Nov 8, 2021

References

github.com / flitbit/json-ptr%23security-vulnerabilities-resolved
Broken LinkThird Party Advisory
github.com / flitbit/json-ptr/commit/5dc458fbad1c382a2e3ca6d62e66ede3d92849ca
PatchThird Party Advisory
github.com / flitbit/json-ptr/pull/42
PatchThird Party Advisory
snyk.io / vuln/SNYK-JAVA-ORGWEBJARSNPM-1767165
ExploitMitigationPatchThird Party AdvisoryVDB Entry
snyk.io / vuln/SNYK-JS-JSONPTR-1577291
ExploitMitigationPatchThird Party AdvisoryVDB Entry