NVD / CVE Program· CNA mitre

CVE-2020-11793: A use-after-free issue exists in WebKitGTK before 2.28.1 and WPE WebKit before 2.28.1 via crafted web content that allows remote attackers…

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 36/100)

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: 2.8% (FIRST EPSS); higher than 87.1% 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 (Alpine:v3.11) 2.28.1-r0; webkit2gtk (Debian:10) 2.26.4-1~deb10u3; webkit2gtk (Debian:12) 2.28.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to webkit2gtk (Alpine:v3.11) 2.28.1-r0; webkit2gtk (Debian:10) 2.26.4-1~deb10u3; webkit2gtk (Debian:12) 2.28.1-1 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

Primary sources: NVD · CVE.org · FIRST EPSS

A use-after-free issue exists in WebKitGTK before 2.28.1 and WPE WebKit before 2.28.1 via crafted web content that allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash).

Published: Apr 17, 2020
Updated: Jun 16, 2026
EPSS: 2.8% · 87th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 35 / 40 · 8.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 2.8%

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.

Is your version affected? Check it

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.

Vendor	Product	CPE
webkitgtk	webkitgtk	cpe:2.3:a:webkitgtk:webkitgtk
wpewebkit	wpe webkit	cpe:2.3:a:wpewebkit:wpe_webkit
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora
opensuse	leap	cpe:2.3:o:opensuse:leap

Affected versions

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

canonical ubuntu linux18.04
canonical ubuntu linux19.10
fedoraproject fedora30
fedoraproject fedora31
fedoraproject fedora32
opensuse leap15.1
webkitgtk webkitgtkbefore 2.28.1
wpewebkit wpe webkitbefore 2.28.1

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Alpine:v3.11	webkit2gtk	before 2.28.1-r0	2.28.1-r0
Debian:10	webkit2gtk	before 2.26.4-1~deb10u3	2.26.4-1~deb10u3
Debian:12	webkit2gtk	before 2.28.1-1	2.28.1-1
Debian:12	wpewebkit	before 2.28.1-1	2.28.1-1
openSUSE:Leap 15.1	webkit2gtk3	before 2.28.1-lp151.2.15.2	2.28.1-lp151.2.15.2
SUSE:Linux Enterprise Module for Basesystem 15 SP1	webkit2gtk3	before 2.28.1-3.49.2	2.28.1-3.49.2

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…
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

Published before and after this one in the same product

← EarlierCVE-2013-7324Feb 17, 2020 · Webkit-GTK 2.x (any version with HTML5 audio/video support based on GStreamer) allows remote attackers to trigger unexpectedly high sound…
21Monitor
← EarlierCVE-2020-10018Mar 2, 2020 · WebKitGTK 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…
40Plan
Later →CVE-2020-13543Dec 3, 2020 · A code execution vulnerability exists in the WebSocket functionality of Webkit WebKitGTK 2.30.0.
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 / package	Fixed version	Source
alpine:webkit2gtk	2.28.1-r0 · Alpine:v3.11	Package registry (OSV)
debian:webkit2gtk	2.28.1-1 · Debian:12	Package registry (OSV)
debian:wpewebkit	2.28.1-1 · Debian:12	Package registry (OSV)
opensuse:webkit2gtk3	2.28.1-lp151.2.15.2 · openSUSE:Leap 15.1	Package registry (OSV)
suse:webkit2gtk3	2.28.1-3.49.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP1	Package 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.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-22-0552 · Aug 15, 2022(RedHat Güvenlik Güncellemesi)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: Required
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
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:H/I:H/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

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&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✗ → ✓Sep 28, 2026, 10:45 PM UTC

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

References

lists.opensuse.org/opensuse-security-announce/2020-05/msg00008.html

Show all references (7 more)

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

All records