CVE-2021-3518

Libxml2 vulnerability

CVSS

8.8

EPSS

3.7%

EPSS pct

88th

Exploited

No known

There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.

Affected vendor

Xmlsoft

Affected product

Libxml2

CVSS vector

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

Weakness type (CWE)

CWE-416 — Use After Free

Published

2021-05-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, 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 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-3518

Confirm whether Xmlsoft Libxml2 is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2021-3518.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-3518

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-3518 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2021-3518?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2021-3518.

Start free scan

No credit card. Agentless.

Related vulnerabilities

HIGH

CVE-2015-2301

Ubuntu Linux vulnerability