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CVE-2020-13936

An attacker that is able to modify Velocity templates may execute arbitrary Java code or run arbitrary system commands with the same privileges as the account running the Servlet container. This applies to applications that allow untrusted users to upload/modify velocity templates running Apache Velocity Engine versions up to 2.2.
A workaround or mitigation is available. Apply it until an official patch is released.
8.8
CVSS
6.8
ShadowTrackr
NO
CISA KEV
M/H
NCSC.nl
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesLow
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusMitigation

Change Log
DateSourceChangesScore
2026-07-21PoCE: U→P5.2 → 6.8
2026-07-21nvdAV: P→N, AC: H→L, PR: H→L, UI: A→N, VC: N→H, VI: N→H, VA: N→H0.0 → 5.2
2026-07-21cve.orginitial, patch: Mitigation0.0
References: CVE.org · NVD · NCSC · PoC

Affected Software
VendorProductVersion
apachevelocity_engine< 2.3
apachewss4j2.3.1
Apache Software FoundationApache Velocity Engine≤ 2.2
debiandebian_linux9.0
oraclebanking_deposits_and_lines_of_credit_servicing2.12.0
oraclebanking_enterprise_default_management≥ 2.3.0, ≤ 2.4.1
oraclebanking_enterprise_default_management2.10.0
oraclebanking_enterprise_default_management2.12.0
oraclebanking_enterprise_default_management2.6.2
oraclebanking_enterprise_default_management2.7.1
oraclebanking_loans_servicing2.12.0
oraclebanking_party_management2.7.0
oraclebanking_platform≥ 2.3.0, ≤ 2.4.1
oraclebanking_platform2.6.2
oraclebanking_platform2.7.1
oraclecommunications_cloud_native_core_policy1.14.0
oraclecommunications_network_integrity7.3.6
oraclehospitality_token_proxy_service19.2
oracleretail_integration_bus19.0.1
oracleretail_order_broker16.0
oracleretail_service_backbone19.0.1
oracleretail_xstore_office_cloud_service16.0.6
oracleretail_xstore_office_cloud_service17.0.4
oracleretail_xstore_office_cloud_service18.0.3
oracleretail_xstore_office_cloud_service19.0.2
oracleretail_xstore_office_cloud_service20.0.1
oracleutilities_testing_accelerator6.0.0.1.1
oracleutilities_testing_accelerator6.0.0.2.2
oracleutilities_testing_accelerator6.0.0.3.1
Published: 2021-03-10