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CVE-2020-13950

Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
7.5
CVSS
6.9
ShadowTrackr
NO
CISA KEV
-
NCSC.nl
CVSS v4.0 Metrics
Exploitability
Attack VectorNetwork
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusUnavailable

Change Log
DateSourceChangesScore
2026-07-21PoCE: U→P4.6 → 6.9
2026-07-21nvdAV: P→N, AC: H→L, PR: H→N, UI: A→N, VA: N→H0.0 → 4.6
2026-07-21cve.orginitial, patch: Unavailable0.0
References: CVE.org · NVD · PoC

Affected Software
VendorProductVersion
apachehttp_server≥ 2.4.41, ≤ 2.4.46
Apache Software FoundationApache HTTP Server2.4.41
Apache Software FoundationApache HTTP Server2.4.43
Apache Software FoundationApache HTTP Server2.4.46
debiandebian_linux10.0
debiandebian_linux9.0
fedoraprojectfedora34
fedoraprojectfedora35
oracleenterprise_manager_ops_center12.4.0.0
oracleinstantis_enterprisetrack17.1
oracleinstantis_enterprisetrack17.2
oracleinstantis_enterprisetrack17.3
oraclezfs_storage_appliance_kit8.8
Published: 2021-06-10