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CVE-2020-9952· NVD / CVE Program· CNA apple

An input validation issue was addressed with improved input validation.

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.4% (FIRST EPSS); higher than 73.5% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: webkit2gtk (Debian:10) 2.28.4-1~deb10u1; webkit2gtk (Debian:12) 2.28.3-1; wpewebkit (Debian:12) 2.28.3-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to webkit2gtk (Debian:10) 2.28.4-1~deb10u1; webkit2gtk (Debian:12) 2.28.3-1; wpewebkit (Debian:12) 2.28.3-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

An input validation issue was addressed with improved input validation. This issue is fixed in iOS 14.0 and iPadOS 14.0, tvOS 14.0, watchOS 7.0, Safari 14.0, iCloud for Windows 11.4, iCloud for Windows 7.21. Processing maliciously crafted web content may lead to a cross site scripting attack.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Oct 16, 2020
Updated
Jun 16, 2026
EPSS
1.5% · 74th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
appleicloud
applesafari
appleipados
appleiphone os
appletvos
applewatchos
webkitwebkitgtk\+

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apple icloud11.0 and later · before 11.4
  • apple icloudbefore 7.21
  • apple ipadosbefore 14.0
  • apple iphone osbefore 14.0
  • apple safaribefore 14.0
  • apple tvosbefore 14.0
  • apple watchosbefore 7.0
  • webkit webkitgtk+up to 2.30.3 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apple). Independent of NVD's CPE analysis and usually ahead of it.

  • Apple iCloud for Windows

    • unspecified and later · before iCloud for Windows 11.4affected

  • Apple iCloud for Windows (Legacy)

    • unspecified and later · before iCloud for Windows 7.21affected

  • Apple iOS

    • unspecified and later · before iOS 14.0 and iPadOS 14.0affected

  • Apple Safari

    • unspecified and later · before Safari 14.0affected

  • Apple tvOS

    • unspecified and later · before tvOS 14.0affected

  • Apple watchOS

    • unspecified and later · before watchOS 7.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10webkit2gtkbefore 2.28.4-1~deb10u12.28.4-1~deb10u1
Debian:12webkit2gtkbefore 2.28.3-12.28.3-1
Debian:12wpewebkitbefore 2.28.3-12.28.3-1
openSUSE:Leap 15.3webkit2gtk3before 2.34.3-23.32.34.3-23.3
SUSE:Linux Enterprise Module for Basesystem 15 SP3webkit2gtk3before 2.34.3-23.32.34.3-23.3

Same product

apple: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-8506A type confusion issue was addressed with improved memory handling.KEV
    70This week
  • CVE-2020-27932A type confusion issue was addressed with improved state handling.KEV
    64This week
  • CVE-2020-9850A logic issue was addressed with improved restrictions.
    62This week
  • CVE-2019-8600A memory corruption issue was addressed with improved input validation.
    45Plan
  • CVE-2019-8746An out-of-bounds read was addressed with improved input validation.
    40Plan
  • CVE-2020-9895A use after free issue was addressed with improved memory management.
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:webkit2gtk2.28.3-1 · Debian:12Package registry (OSV)
debian:wpewebkit2.28.3-1 · Debian:12Package registry (OSV)
opensuse:webkit2gtk32.34.3-23.3 · openSUSE:Leap 15.3Package registry (OSV)
suse:webkit2gtk32.34.3-23.3 · SUSE:Linux Enterprise Module for Basesystem 15 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

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

nvd-primary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records