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CVE-2021-45482· NVD / CVE Program· CNA mitre

In WebKitGTK before 2.32.4, there is a use-after-free in WebCore::ContainerNode::firstChild, a different vulnerability than CVE-2021-30889.

Noroxi assessment

Priority: Monitor (action score 26/100)

  • 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 72.3% 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) 2.32.4-1~deb10u1; webkit2gtk (Debian:11) 2.32.4-1~deb11u1; wpewebkit (Debian:11) 2.32.4-1~deb11u1.

Low priority for now. Upgrade to webkit2gtk (Debian:10) 2.32.4-1~deb10u1; webkit2gtk (Debian:11) 2.32.4-1~deb11u1; wpewebkit (Debian:11) 2.32.4-1~deb11u1 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

Primary sources: NVD · CVE.org · FIRST EPSS

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Dec 24, 2021
Updated
Jun 17, 2026
EPSS
1.4% · 72th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.4%

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.

Follow CVE-2021-45482

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
webkitgtkwebkitgtk

Affected versions

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

  • webkitgtk webkitgtkbefore 2.32.4

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:10webkit2gtkbefore 2.32.4-1~deb10u12.32.4-1~deb10u1
Debian:11webkit2gtkbefore 2.32.4-1~deb11u12.32.4-1~deb11u1
Debian:11wpewebkitbefore 2.32.4-1~deb11u12.32.4-1~deb11u1
Debian:12webkit2gtkbefore 2.32.4-12.32.4-1
Debian:12wpewebkitbefore 2.32.4-12.32.4-1
openSUSE:Leap 15.3webkit2gtk3before 2.34.6-29.12.34.6-29.1
SUSE:HPE Helion OpenStack 8webkit2gtk3before 2.34.5-2.85.32.34.5-2.85.3
SUSE:Linux Enterprise High Performance Computing 15-ESPOSwebkit2gtk3before 2.34.6-3.97.12.34.6-3.97.1
SUSE:Linux Enterprise Module for Basesystem 15 SP3webkit2gtk3before 2.34.6-29.12.34.6-29.1

Same product

webkitgtk: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-8720A vulnerability was found in WebKit.KEV
    65This week
  • CVE-2019-8375The UIProcess subsystem in WebKit, as used in WebKitGTK through 2.23.90 and WebKitGTK+ through 2.22.6 and other products, does not prevent t
    44Plan
  • CVE-2020-13753The bubblewrap sandbox of WebKitGTK and WPE WebKit, prior to 2.28.3, failed to properly block access to CLONE_NEWUSER and the TIOCSTI ioctl.
    41Plan
  • CVE-2020-10018WebKitGTK through 2.26.4 and WPE WebKit through 2.26.4 (which are the versions right before 2.28.0) contains a memory corruption issue (use-
    40Plan
  • CVE-2021-21806An exploitable use-after-free vulnerability exists in WebKitGTK browser version 2.30.3 x64.
    36Monitor
  • CVE-2021-21779A use-after-free vulnerability exists in the way Webkit’s GraphicsContext handles certain events in WebKitGTK 2.30.4.
    36Monitor

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:webkit2gtk2.32.4-1 · Debian:12Package registry (OSV)
debian:wpewebkit2.32.4-1 · Debian:12Package registry (OSV)
opensuse:webkit2gtk32.34.6-29.1 · openSUSE:Leap 15.3Package registry (OSV)
suse:webkit2gtk32.34.5-2.85.3 · SUSE:HPE Helion OpenStack 8Package 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).

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

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

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

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

All records