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Vulnerabilities/CVE-2021-3518
Vulnerability dossier

CVE-2021-3518

VendororaclePublishedMay 18, 2021SourceNVDWeaknessCWE-416
Plan a fix

Severe, but no confirmed exploitation yet. Schedule remediation in your next patch cycle and apply mitigations if you're exposed.

Severity
High · 8.8
CVSS base score
Exploitation
Not observed
No known exploitation or public exploit
Exploit likelihood
22%
Chance of exploitation in 30 days (EPSS)
Exposure
Remote
Exploitable over the network without credentials
01

What's the risk?

An unauthenticated attacker, remotely over the network, if a user is tricked into opening a malicious file or link, can fully compromise the system — steal data, tamper with it and take it offline.

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.

How it's exploitedMITRE ATT&CK · inferred from weakness & vector
Execution
T1203Exploitation for Client Execution

Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.

02

Are we affected?

21
  • Affecteddebian · debian_linux9.0
  • Affectedfedoraproject · fedora33
  • Affectedfedoraproject · fedora34
  • Affectednetapp · active_iq_unified_managerall versions
  • Affectednetapp · clustered_data_ontapall versions
  • Affectednetapp · clustered_data_ontap_antivirus_connectorall versions
  • Affected
netapp · hci_h410c_firmware
all versions
  • Affectednetapp · manageability_software_development_kitall versions
  • Affectednetapp · ontap_select_deploy_administration_utilityall versions
  • Affectednetapp · snapdriveall versions
  • Affectedoracle · communications_cloud_native_core_network_function_cloud_native_environment1.10.0
  • Affectedoracle · enterprise_manager_base_platform13.5.0.0
  • Affectedoracle · enterprise_manager_base_platform13.4.0.0
  • Affectedoracle · enterprise_manager_ops_center12.4.0.0
  • Affectedoracle · mysql_workbench≤ 8.0.26
  • Affectedoracle · peoplesoft_enterprise_peopletools8.58
  • Affectedoracle · real_user_experience_insight13.5.1.0
  • Affectedoracle · real_user_experience_insight13.4.1.0
  • Affectedredhat · enterprise_linux8.0
  • Affectedredhat · jboss_core_servicesall versions
  • Affectedxmlsoft · libxml2< 2.9.11↑ fixed 2.9.11
  • 03

    What to do

    Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.

    Generating AI analysis…
    Technical details— weakness, CVSS vector & calculator, related CVEs

    Weakness

    1
    CWE-416Common Weakness Enumeration · MITRE definition

    CVSS 3.1 details

    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    0.0
    / 10.0 base
    High severity
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    Exploitability metrics
    Attack VectorAV
    Remotely exploitable across a network
    Attack ComplexityAC
    No special conditions required
    Privileges RequiredPR
    No authorization needed
    User InteractionUI
    A user must take an action
    Impact metrics
    ScopeS
    Impact confined to the vulnerable component
    ConfidentialityC
    Total loss of confidentiality
    IntegrityI
    Total loss of integrity
    AvailabilityA
    Total loss of availability

    Related vulnerabilities

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    0.0
    / 10.0 base
    High severity
    Key facts
    CVE ID
    CVE-2021-3518
    Published
    May 18, 2021
    Last modified
    Oct 14, 2026
    CVSS
    8.8 (v3.1)
    EPSS
    21.86%
    In CISA KEV
    No
    Confidence
    92/100
    Weakness
    CWE-416
    Fixed in
    2.9.11
    Timeline
    1. May 18, 2021Published to NVDNVD
    2. Oct 14, 2026Record last modifiedNVD
    View on NVD