THREATPORT/VULNERABILITY/CVE-2021-21797
HIGH SEVERITY

CVE-2021-21797

Nitro Pro vulnerability

CVSS
7.8
EPSS
15.0%
EPSS pct
96th
Exploited
No known
An exploitable double-free vulnerability exists in the JavaScript implementation of Nitro Pro PDF. A specially crafted document can cause a reference to a timeout object to be stored in two different places. When closed, the document will result in the reference being released twice. This can lead to code execution under the context of the application. An attacker can convince a user to open a document to trigger this vulnerability.
Affected vendor
Gonitro
Affected product
Nitro Pro
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness type (CWE)
Published
2021-10-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 15.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-21797

  • Confirm whether Gonitro Nitro Pro is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-21797.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-21797

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-21797 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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