Common Weakness Enumeration
CWE-772
AllowedMissing Release of Resource after Effective Lifetime
Abstraction: Base · Status: Draft
The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.
602 vulnerabilities reference this CWE, most recent first.
GHSA-6JV9-X5W9-2CCM
Vulnerability from github – Published: 2026-06-11 13:26 – Updated: 2026-08-12 12:32
VLAI
Summary
Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregator
Details
Impact
The RedisArrayAggregator handler permanently leaks pooled direct-memory buffers when a Redis pipeline connection closes before a RESP array aggregate completes. The handler retains child messages in per-handler state (depths field) but defines no channelInactive, handlerRemoved, or exceptionCaught method to release them when the pipeline tears down. Because the leaked buffers are slices of PooledByteBufAllocator chunks, they prevent those chunks from being returned to the JVM-wide direct-memory pool. Repeated connection churn by any network peer monotonically drains this shared pool, eventually causing allocation failures on all Netty channels in the process.
Severity
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 4.2.14.Final"
},
"package": {
"ecosystem": "Maven",
"name": "io.netty:netty-codec-redis"
},
"ranges": [
{
"events": [
{
"introduced": "4.2.0.Final"
},
{
"fixed": "4.2.15.Final"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 4.1.134.Final"
},
"package": {
"ecosystem": "Maven",
"name": "io.netty:netty-codec-redis"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.135.Final"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-48006"
],
"database_specific": {
"cwe_ids": [
"CWE-401",
"CWE-772"
],
"github_reviewed": true,
"github_reviewed_at": "2026-06-11T13:26:06Z",
"nvd_published_at": "2026-06-12T16:16:30Z",
"severity": "HIGH"
},
"details": "### Impact\nThe RedisArrayAggregator handler permanently leaks pooled direct-memory buffers when a Redis pipeline connection closes before a RESP array aggregate completes. The handler retains child messages in per-handler state (`depths` field) but defines no `channelInactive`, `handlerRemoved`, or `exceptionCaught` method to release them when the pipeline tears down. Because the leaked buffers are slices of `PooledByteBufAllocator` chunks, they prevent those chunks from being returned to the JVM-wide direct-memory pool. Repeated connection churn by any network peer monotonically drains this shared pool, eventually causing allocation failures on all Netty channels in the process.",
"id": "GHSA-6jv9-x5w9-2ccm",
"modified": "2026-08-12T12:32:49Z",
"published": "2026-06-11T13:26:06Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/netty/netty/security/advisories/GHSA-6jv9-x5w9-2ccm"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48006"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:37390"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:41951"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:50085"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:53644"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:53806"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-48006"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488433"
},
{
"type": "PACKAGE",
"url": "https://github.com/netty/netty"
},
{
"type": "WEB",
"url": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"
},
{
"type": "WEB",
"url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"
},
{
"type": "WEB",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48006.json"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Netty\u0027s Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregator"
}
GHSA-6M36-3RF7-2WPF
Vulnerability from github – Published: 2022-05-13 01:42 – Updated: 2022-05-13 01:42
VLAI
Details
When ImageMagick 7.0.6-1 processes a crafted file in convert, it can lead to a Memory Leak in the ReadMATImage() function in coders/mat.c.
Severity
6.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2017-11644"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-07-26T08:29:00Z",
"severity": "MODERATE"
},
"details": "When ImageMagick 7.0.6-1 processes a crafted file in convert, it can lead to a Memory Leak in the ReadMATImage() function in coders/mat.c.",
"id": "GHSA-6m36-3rf7-2wpf",
"modified": "2022-05-13T01:42:28Z",
"published": "2022-05-13T01:42:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-11644"
},
{
"type": "WEB",
"url": "https://github.com/ImageMagick/ImageMagick/issues/587"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/100014"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6PC5-JFVJ-857M
Vulnerability from github – Published: 2022-05-13 01:49 – Updated: 2022-05-13 01:49
VLAI
Details
libsixel 1.8.1 has a memory leak in sixel_allocator_new in allocator.c.
Severity
7.5 (High)
{
"affected": [],
"aliases": [
"CVE-2018-14073"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-07-15T18:29:00Z",
"severity": "HIGH"
},
"details": "libsixel 1.8.1 has a memory leak in sixel_allocator_new in allocator.c.",
"id": "GHSA-6pc5-jfvj-857m",
"modified": "2022-05-13T01:49:54Z",
"published": "2022-05-13T01:49:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-14073"
},
{
"type": "WEB",
"url": "https://github.com/saitoha/libsixel/issues/67#issuecomment-404989926"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6PCH-HQ5W-RG79
Vulnerability from github – Published: 2022-05-13 01:51 – Updated: 2022-05-13 01:51
VLAI
Details
An issue was discovered in Bento4 1.5.1-627. There is a memory leak in AP4_StdcFileByteStream::Create in System/StdC/Ap4StdCFileByteStream.cpp, as demonstrated by mp42hls.
Severity
6.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2018-20408"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-12-23T23:29:00Z",
"severity": "MODERATE"
},
"details": "An issue was discovered in Bento4 1.5.1-627. There is a memory leak in AP4_StdcFileByteStream::Create in System/StdC/Ap4StdCFileByteStream.cpp, as demonstrated by mp42hls.",
"id": "GHSA-6pch-hq5w-rg79",
"modified": "2022-05-13T01:51:03Z",
"published": "2022-05-13T01:51:03Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-20408"
},
{
"type": "WEB",
"url": "https://github.com/axiomatic-systems/Bento4/issues/343"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6PV2-QC8V-R267
Vulnerability from github – Published: 2026-06-08 18:31 – Updated: 2026-07-09 00:31
VLAI
Details
In the Linux kernel, the following vulnerability has been resolved:
pmdomain: core: Fix detach procedure for virtual devices in genpd
If a device is attached to a PM domain through genpd_dev_pm_attach_by_id(), genpd calls pm_runtime_enable() for the corresponding virtual device that it registers. While this avoids boilerplate code in drivers, there is no corresponding call to pm_runtime_disable() in genpd_dev_pm_detach().
This means these virtual devices are typically detached from its genpd, while runtime PM remains enabled for them, which is not how things are designed to work. In worst cases it may lead to critical errors, like a NULL pointer dereference bug in genpd_runtime_suspend(), which was recently reported. For another case, we may end up keeping an unnecessary vote for a performance state for the device.
To fix these problems, let's add this missing call to pm_runtime_disable() in genpd_dev_pm_detach().
Severity
5.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2026-46292"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-08T17:16:47Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\npmdomain: core: Fix detach procedure for virtual devices in genpd\n\nIf a device is attached to a PM domain through genpd_dev_pm_attach_by_id(),\ngenpd calls pm_runtime_enable() for the corresponding virtual device that\nit registers. While this avoids boilerplate code in drivers, there is no\ncorresponding call to pm_runtime_disable() in genpd_dev_pm_detach().\n\nThis means these virtual devices are typically detached from its genpd,\nwhile runtime PM remains enabled for them, which is not how things are\ndesigned to work. In worst cases it may lead to critical errors, like a\nNULL pointer dereference bug in genpd_runtime_suspend(), which was recently\nreported. For another case, we may end up keeping an unnecessary vote for a\nperformance state for the device.\n\nTo fix these problems, let\u0027s add this missing call to pm_runtime_disable()\nin genpd_dev_pm_detach().",
"id": "GHSA-6pv2-qc8v-r267",
"modified": "2026-07-09T00:31:05Z",
"published": "2026-06-08T18:31:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46292"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/26735dfdd8930d9ef1fa92e590a9bf77726efdf6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/361518a26e4434e879db6ff43bf364795dcbfbff"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/51a7dd9cbae9210335ce398642ecaaa52c939eb5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/52e485ed0dcb5496864003ba9ffcef7d5b613f83"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/707cb5df3eab32ddc52979418f7ace62941e6381"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8d44391a7f29e4601e8243f13498d0219bab2576"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/98b8104978474d381256a2b2fb0e7ca8e05a7bfa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e8f8dad44f024a5c99e54a48ad5c943fa8e54319"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6Q2V-X4CV-GHQX
Vulnerability from github – Published: 2022-05-13 01:31 – Updated: 2022-05-13 01:31
VLAI
Details
Memory leak in the irda_bind function in net/irda/af_irda.c and later in drivers/staging/irda/net/af_irda.c in the Linux kernel before 4.17 allows local users to cause a denial of service (memory consumption) by repeatedly binding an AF_IRDA socket.
Severity
5.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2018-6554"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-09-04T18:29:00Z",
"severity": "MODERATE"
},
"details": "Memory leak in the irda_bind function in net/irda/af_irda.c and later in drivers/staging/irda/net/af_irda.c in the Linux kernel before 4.17 allows local users to cause a denial of service (memory consumption) by repeatedly binding an AF_IRDA socket.",
"id": "GHSA-6q2v-x4cv-ghqx",
"modified": "2022-05-13T01:31:59Z",
"published": "2022-05-13T01:31:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-6554"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3775-1"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3775-2"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3776-1"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3776-2"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3777-1"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3777-2"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3777-3"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2018/dsa-4308"
},
{
"type": "WEB",
"url": "https://www.spinics.net/lists/stable/msg255030.html"
},
{
"type": "WEB",
"url": "https://www.spinics.net/lists/stable/msg255034.html"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/105302"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-6VQH-X4XP-MQX7
Vulnerability from github – Published: 2022-05-13 01:44 – Updated: 2022-05-13 01:44
VLAI
Details
Huawei Secospace AntiDDoS8000 V500R001C20SPC500 have a memory leak vulnerability due to memory don't be released when the system open some function. An attacker could exploit it to cause memory leak, which may further lead to system exceptions.
Severity
5.3 (Medium)
{
"affected": [],
"aliases": [
"CVE-2017-17164"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-02-15T16:29:00Z",
"severity": "MODERATE"
},
"details": "Huawei Secospace AntiDDoS8000 V500R001C20SPC500 have a memory leak vulnerability due to memory don\u0027t be released when the system open some function. An attacker could exploit it to cause memory leak, which may further lead to system exceptions.",
"id": "GHSA-6vqh-x4xp-mqx7",
"modified": "2022-05-13T01:44:18Z",
"published": "2022-05-13T01:44:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-17164"
},
{
"type": "WEB",
"url": "http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20171213-01-antidos-en"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
}
]
}
GHSA-6XQP-CPJ7-9325
Vulnerability from github – Published: 2022-05-13 01:07 – Updated: 2022-05-13 01:07
VLAI
Details
Memory leak in the usb_xhci_exit function in hw/usb/hcd-xhci.c in QEMU (aka Quick Emulator), when the xhci uses msix, allows local guest OS administrators to cause a denial of service (memory consumption and possibly QEMU process crash) by repeatedly unplugging a USB device.
Severity
6.0 (Medium)
{
"affected": [],
"aliases": [
"CVE-2016-7466"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2016-12-10T00:59:00Z",
"severity": "MODERATE"
},
"details": "Memory leak in the usb_xhci_exit function in hw/usb/hcd-xhci.c in QEMU (aka Quick Emulator), when the xhci uses msix, allows local guest OS administrators to cause a denial of service (memory consumption and possibly QEMU process crash) by repeatedly unplugging a USB device.",
"id": "GHSA-6xqp-cpj7-9325",
"modified": "2022-05-13T01:07:29Z",
"published": "2022-05-13T01:07:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2016-7466"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2017:2392"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2017:2408"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2016-7466"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1377837"
},
{
"type": "WEB",
"url": "https://lists.gnu.org/archive/html/qemu-devel/2016-09/msg02773.html"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/201611-11"
},
{
"type": "WEB",
"url": "http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=b53dd4495ced2432a0b652ea895e651d07336f7e"
},
{
"type": "WEB",
"url": "http://git.qemu.org/?p=qemu.git;a=commit;h=b53dd4495ced2432a0b652ea895e651d07336f7e"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-updates/2016-12/msg00140.html"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2016/09/19/8"
},
{
"type": "WEB",
"url": "http://www.openwall.com/lists/oss-security/2016/09/20/3"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/93029"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-736M-VF8J-9HJV
Vulnerability from github – Published: 2022-05-13 01:47 – Updated: 2022-05-13 01:47
VLAI
Details
The function named ReadICONImage in coders\icon.c in ImageMagick 7.0.5-5 has a memory leak vulnerability which can cause memory exhaustion via a crafted ICON file.
Severity
6.5 (Medium)
{
"affected": [],
"aliases": [
"CVE-2017-8765"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-05-04T04:59:00Z",
"severity": "HIGH"
},
"details": "The function named ReadICONImage in coders\\icon.c in ImageMagick 7.0.5-5 has a memory leak vulnerability which can cause memory exhaustion via a crafted ICON file.",
"id": "GHSA-736m-vf8j-9hjv",
"modified": "2022-05-13T01:47:42Z",
"published": "2022-05-13T01:47:42Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-8765"
},
{
"type": "WEB",
"url": "https://github.com/ImageMagick/ImageMagick/issues/466"
},
{
"type": "WEB",
"url": "http://www.debian.org/security/2017/dsa-3863"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/98688"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-767R-M8M9-RF56
Vulnerability from github – Published: 2022-03-01 00:00 – Updated: 2022-03-17 00:04
VLAI
Details
A buffer overflow in Mikrotik RouterOS 6.47 allows unauthenticated attackers to cause a denial of service (DOS) via crafted SMB requests.
Severity
7.5 (High)
{
"affected": [],
"aliases": [
"CVE-2020-22844"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-02-28T19:15:00Z",
"severity": "HIGH"
},
"details": "A buffer overflow in Mikrotik RouterOS 6.47 allows unauthenticated attackers to cause a denial of service (DOS) via crafted SMB requests.",
"id": "GHSA-767r-m8m9-rf56",
"modified": "2022-03-17T00:04:44Z",
"published": "2022-03-01T00:00:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-22844"
},
{
"type": "WEB",
"url": "https://github.com/colorlight/mikrotik_poc/blob/master/two_vulns.md"
},
{
"type": "WEB",
"url": "https://mikrotik.com/support"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-3
Requirements
Strategy: Language Selection
- Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- For example, languages such as Java, Ruby, and Lisp perform automatic garbage collection that releases memory for objects that have been deallocated.
Mitigation
Implementation
It is good practice to be responsible for freeing all resources you allocate and to be consistent with how and where you free resources in a function. If you allocate resources that you intend to free upon completion of the function, you must be sure to free the resources at all exit points for that function including error conditions.
Mitigation MIT-47
Operation
Architecture and Design
Strategy: Resource Limitation
- Use resource-limiting settings provided by the operating system or environment. For example, when managing system resources in POSIX, setrlimit() can be used to set limits for certain types of resources, and getrlimit() can determine how many resources are available. However, these functions are not available on all operating systems.
- When the current levels get close to the maximum that is defined for the application (see CWE-770), then limit the allocation of further resources to privileged users; alternately, begin releasing resources for less-privileged users. While this mitigation may protect the system from attack, it will not necessarily stop attackers from adversely impacting other users.
- Ensure that the application performs the appropriate error checks and error handling in case resources become unavailable (CWE-703).
CAPEC-469: HTTP DoS
An attacker performs flooding at the HTTP level to bring down only a particular web application rather than anything listening on a TCP/IP connection. This denial of service attack requires substantially fewer packets to be sent which makes DoS harder to detect. This is an equivalent of SYN flood in HTTP. The idea is to keep the HTTP session alive indefinitely and then repeat that hundreds of times. This attack targets resource depletion weaknesses in web server software. The web server will wait to attacker's responses on the initiated HTTP sessions while the connection threads are being exhausted.