Common Weakness Enumeration
CWE-401
AllowedMissing Release of Memory after Effective Lifetime
Abstraction: Variant · Status: Draft
The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
2087 vulnerabilities reference this CWE, most recent first.
CVE-2021-44540 (GCVE-0-2021-44540)
Vulnerability from cvelistv5 – Published: 2021-12-23 19:48 – Updated: 2024-08-04 04:25
VLAI
EPSS
VEX
Summary
A vulnerability was found in Privoxy which was fixed in get_url_spec_param() by freeing memory of compiled pattern spec before bailing.
Severity
No CVSS data available.
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.privoxy.org/3.0.33/user-manual/whatsn… | x_refsource_MISC |
| https://www.privoxy.org/gitweb/?p=privoxy.git%3Ba… | x_refsource_MISC |
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CVE-2021-39176 (GCVE-0-2021-39176)
Vulnerability from cvelistv5 – Published: 2021-08-31 18:05 – Updated: 2024-08-04 01:58
VLAI
EPSS
VEX
Title
Missing Release of Memory after Effective Lifetime in detect-character-encoding
Summary
detect-character-encoding is a package for detecting character encoding using ICU. In detect-character-encoding v0.3.0 and earlier, allocated memory is not released. The problem has been patched in detect-character-encoding v0.3.1.
Severity
7.5 (High)
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sonicdoe/detect-character-enco… | x_refsource_CONFIRM |
| https://github.com/sonicdoe/detect-character-enco… | x_refsource_MISC |
| https://github.com/sonicdoe/detect-character-enco… | x_refsource_MISC |
| https://github.com/sonicdoe/detect-character-enco… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sonicdoe | detect-character-encoding |
Affected:
< 0.3.1
|
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CVE-2021-37205 (GCVE-0-2021-37205)
Vulnerability from cvelistv5 – Published: 2022-02-09 15:16 – Updated: 2025-04-18 18:29
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in SIMATIC Drive Controller family (All versions >= V2.9.2 < V2.9.4), SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V21.9 < V21.9.4), SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (All versions >= V4.5.0 < V4.5.2), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.9.2 < V2.9.4), SIMATIC S7-1500 Software Controller (All versions >= V21.9 < V21.9.4), SIMATIC S7-PLCSIM Advanced (All versions >= V4.0 < V4.0 SP1), SIPLUS TIM 1531 IRC (All versions < V2.3.6), TIM 1531 IRC (All versions < V2.3.6). An unauthenticated attacker could cause a denial-of-service condition in a PLC when sending specially prepared packets over port 102/tcp. A restart of the affected device is needed to restore normal operations.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-18 15:12 UTC
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
1 reference
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | SIMATIC Drive Controller family |
Affected:
All versions >= V2.9.2 < V2.9.4
|
|
| Siemens | SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) |
Affected:
All versions >= V21.9 < V21.9.4
|
|
| Siemens | SIMATIC S7-1200 CPU family (incl. SIPLUS variants) |
Affected:
All versions >= V4.5.0 < V4.5.2
|
|
| Siemens | SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) |
Affected:
All versions >= V2.9.2 < V2.9.4
|
|
| Siemens | SIMATIC S7-1500 Software Controller |
Affected:
All versions >= V21.9 < V21.9.4
|
|
| Siemens | SIMATIC S7-PLCSIM Advanced |
Affected:
All versions >= V4.0 < V4.0 SP1
|
|
| Siemens | SIPLUS TIM 1531 IRC |
Affected:
All versions < V2.3.6
|
|
| Siemens | TIM 1531 IRC |
Affected:
All versions < V2.3.6
|
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CVE-2021-34740 (GCVE-0-2021-34740)
Vulnerability from cvelistv5 – Published: 2021-09-23 02:26 – Updated: 2024-11-07 21:58
VLAI
EPSS
VEX
Title
Cisco Aironet Access Points WLAN Control Protocol Packet Buffer Leak Denial of Service Vulnerability
Summary
A vulnerability in the WLAN Control Protocol (WCP) implementation for Cisco Aironet Access Point (AP) software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to incorrect error handling when an affected device receives an unexpected 802.11 frame. An attacker could exploit this vulnerability by sending certain 802.11 frames over the wireless network to an interface on an affected AP. A successful exploit could allow the attacker to cause a packet buffer leak. This could eventually result in buffer allocation failures, which would trigger a reload of the affected device.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-07 21:40 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://tools.cisco.com/security/center/content/C… | vendor-advisoryx_refsource_CISCO |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Aironet Access Point Software |
Affected:
n/a
|
Date Public
2021-09-22 00:00
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CVE-2021-34698 (GCVE-0-2021-34698)
Vulnerability from cvelistv5 – Published: 2021-10-06 19:46 – Updated: 2024-11-07 21:47
VLAI
EPSS
VEX
Title
Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability
Summary
A vulnerability in the proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management in the proxy service of an affected device. An attacker could exploit this vulnerability by establishing a large number of HTTPS connections to the affected device. A successful exploit could allow the attacker to cause the system to stop processing new connections, which could result in a DoS condition. Note: Manual intervention may be required to recover from this situation.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-11-07 21:47 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://tools.cisco.com/security/center/content/C… | vendor-advisoryx_refsource_CISCO |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco Web Security Appliance (WSA) |
Affected:
n/a
|
Date Public
2021-10-06 00:00
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CVE-2021-34598 (GCVE-0-2021-34598)
Vulnerability from cvelistv5 – Published: 2021-11-10 11:22 – Updated: 2024-09-16 18:39
VLAI
EPSS
VEX
Title
Phoenix Contact: FL MGUARD lack of memory release in remote logging functionality
Summary
In Phoenix Contact FL MGUARD 1102 and 1105 in Versions 1.4.0, 1.4.1 and 1.5.0 the remote logging functionality is impaired by the lack of memory release for data structures from syslog-ng when remote logging is active
Severity
7.5 (High)
CWE
- CWE-401 - Improper Release of Memory Before Removing Last Reference
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://cert.vde.com/en/advisories/VDE-2021-046/ | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| PHOENIX CONTACT | FL MGUARD |
Affected:
1.4.0 , < FL MGUARD 1102 (No. 1153079)*
(custom)
Affected: 1.4.0 , < FL MGUARD 1105 (No. 1153078)* (custom) |
Date Public
2021-11-10 00:00
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CVE-2021-34431 (GCVE-0-2021-34431)
Vulnerability from cvelistv5 – Published: 2021-07-22 13:45 – Updated: 2024-08-04 00:12
VLAI
EPSS
VEX
Summary
In Eclipse Mosquitto version 1.6 to 2.0.10, if an authenticated client that had connected with MQTT v5 sent a crafted CONNECT message to the broker a memory leak would occur, which could be used to provide a DoS attack against the broker.
Severity
No CVSS data available.
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://bugs.eclipse.org/bugs/show_bug.cgi?id=573191 | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Eclipse Foundation | Eclipse Mosquitto |
Affected:
1.6 , < unspecified
(custom)
Affected: unspecified , ≤ 2.0.10 (custom) |
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CVE-2021-33646 (GCVE-0-2021-33646)
Vulnerability from cvelistv5 – Published: 2022-08-09 00:00 – Updated: 2025-11-03 20:33
VLAI
EPSS
VEX
Summary
The th_read() function doesn’t free a variable t->th_buf.gnu_longname after allocating memory, which may cause a memory leak.
Severity
No CVSS data available.
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://www.openeuler.org/en/security/safety-bull… | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.debian.org/debian-lts-announce/2025… |
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CVE-2021-33645 (GCVE-0-2021-33645)
Vulnerability from cvelistv5 – Published: 2022-08-09 00:00 – Updated: 2025-11-03 20:33
VLAI
EPSS
VEX
Summary
The th_read() function doesn’t free a variable t->th_buf.gnu_longlink after allocating memory, which may cause a memory leak.
Severity
No CVSS data available.
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://www.openeuler.org/en/security/safety-bull… | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.debian.org/debian-lts-announce/2025… |
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CVE-2021-31367 (GCVE-0-2021-31367)
Vulnerability from cvelistv5 – Published: 2021-10-19 18:16 – Updated: 2024-09-16 21:08
VLAI
EPSS
VEX
Title
Junos OS: PTX Series: An FPC heap memory leak will be triggered by certain Flowspec route operations which can lead to an FPC crash
Summary
A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on PTX Series allows an adjacent attacker to cause a Denial of Service (DoS) by sending genuine BGP flowspec packets which cause an FPC heap memory leak. Once having run out of memory the FPC will crash and restart along with a core dump. Continued receipted of these packets will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R1-S4, 19.4R3-S6; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos Evolved is not affected.
Severity
6.5 (Medium)
CWE
- CWE-401 - Improper Release of Memory Before Removing Last Reference
- Denial of Service (DoS)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://kb.juniper.net/JSA11229 | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
unspecified , < 18.4R3-S9
(custom)
Affected: 19.1 , < 19.1R3-S7 (custom) Affected: 19.2 , < 19.2R1-S7, 19.2R3-S3 (custom) Affected: 19.3 , < 19.3R2-S6, 19.3R3-S3 (custom) Affected: 19.4 , < 19.4R1-S4, 19.4R3-S6 (custom) Affected: 20.1 , < 20.1R2-S2, 20.1R3 (custom) Affected: 20.2 , < 20.2R3-S1 (custom) Affected: 20.3 , < 20.3R3 (custom) Affected: 20.4 , < 20.4R3 (custom) Affected: 21.1 , < 21.1R2 (custom) |
Date Public
2021-10-13 00:00
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Mitigation MIT-41
Implementation
Strategy: Libraries or Frameworks
- Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
- For example, glibc in Linux provides protection against free of invalid pointers.
- When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
- To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.
Mitigation
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Mitigation
Architecture and Design
Build and Compilation
Consider using the Boehm-Demers-Weiser garbage collector (bdwgc), which can help avoid leaks.
No CAPEC attack patterns related to this CWE.