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.
594 vulnerabilities reference this CWE, most recent first.
GHSA-QRV8-66MV-3WGG
Vulnerability from github – Published: 2022-05-13 01:47 – Updated: 2022-05-13 01:47In ImageMagick 7.0.5-5, a memory leak was found in the function ReadPSDChannel in coders/psd.c, which allows attackers to cause a denial of service via a crafted file.
{
"affected": [],
"aliases": [
"CVE-2017-9440"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-06-05T18:29:00Z",
"severity": "MODERATE"
},
"details": "In ImageMagick 7.0.5-5, a memory leak was found in the function ReadPSDChannel in coders/psd.c, which allows attackers to cause a denial of service via a crafted file.",
"id": "GHSA-qrv8-66mv-3wgg",
"modified": "2022-05-13T01:47:58Z",
"published": "2022-05-13T01:47:58Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-9440"
},
{
"type": "WEB",
"url": "https://github.com/ImageMagick/ImageMagick/issues/462"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/98908"
}
],
"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-QRXH-QRGR-2433
Vulnerability from github – Published: 2022-05-13 01:52 – Updated: 2022-05-13 01:52ImageMagick 7.0.7-22 Q16 has memory leaks in the ReadDCMImage function in coders/dcm.c.
{
"affected": [],
"aliases": [
"CVE-2018-5357"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-01-12T09:29:00Z",
"severity": "MODERATE"
},
"details": "ImageMagick 7.0.7-22 Q16 has memory leaks in the ReadDCMImage function in coders/dcm.c.",
"id": "GHSA-qrxh-qrgr-2433",
"modified": "2022-05-13T01:52:47Z",
"published": "2022-05-13T01:52:47Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5357"
},
{
"type": "WEB",
"url": "https://github.com/ImageMagick/ImageMagick/issues/941"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3681-1"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/102497"
}
],
"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-QV87-QCF5-VF47
Vulnerability from github – Published: 2022-05-13 01:42 – Updated: 2022-05-13 01:42The ReadMAGICKImage function in coders/magick.c in ImageMagick 7.0.6-4 allows remote attackers to cause a denial of service (memory leak) via a crafted file.
{
"affected": [],
"aliases": [
"CVE-2017-11752"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-07-30T18:29:00Z",
"severity": "MODERATE"
},
"details": "The ReadMAGICKImage function in coders/magick.c in ImageMagick 7.0.6-4 allows remote attackers to cause a denial of service (memory leak) via a crafted file.",
"id": "GHSA-qv87-qcf5-vf47",
"modified": "2022-05-13T01:42:30Z",
"published": "2022-05-13T01:42:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-11752"
},
{
"type": "WEB",
"url": "https://github.com/ImageMagick/ImageMagick/issues/628"
}
],
"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-QX7P-9CRP-H4HF
Vulnerability from github – Published: 2026-09-08 18:33 – Updated: 2026-09-08 18:33Missing release of resource after effective lifetime in Windows Secure Socket Tunneling Protocol (SSTP) allows an authorized attacker to deny service locally.
{
"affected": [],
"aliases": [
"CVE-2026-72931"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-08T18:20:17Z",
"severity": "MODERATE"
},
"details": "Missing release of resource after effective lifetime in Windows Secure Socket Tunneling Protocol (SSTP) allows an authorized attacker to deny service locally.",
"id": "GHSA-qx7p-9crp-h4hf",
"modified": "2026-09-08T18:33:10Z",
"published": "2026-09-08T18:33:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72931"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72931"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-QXJR-5WVF-X33F
Vulnerability from github – Published: 2022-05-13 01:42 – Updated: 2022-05-13 01:42Memory leak in CCN-lite before 2.00 allows context-dependent attackers to cause a denial of service (memory consumption) by leveraging failure to allocate memory for the comp or complen structure member.
{
"affected": [],
"aliases": [
"CVE-2017-12467"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-02-07T17:29:00Z",
"severity": "HIGH"
},
"details": "Memory leak in CCN-lite before 2.00 allows context-dependent attackers to cause a denial of service (memory consumption) by leveraging failure to allocate memory for the comp or complen structure member.",
"id": "GHSA-qxjr-5wvf-x33f",
"modified": "2022-05-13T01:42:41Z",
"published": "2022-05-13T01:42:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-12467"
},
{
"type": "WEB",
"url": "https://github.com/cn-uofbasel/ccn-lite/issues/133"
},
{
"type": "WEB",
"url": "https://github.com/cn-uofbasel/ccn-lite/releases/tag/2.0.0"
}
],
"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-QXX9-PW4X-FC72
Vulnerability from github – Published: 2022-05-24 16:59 – Updated: 2024-04-04 02:30A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2
{
"affected": [],
"aliases": [
"CVE-2019-6474"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-10-16T18:15:00Z",
"severity": "MODERATE"
},
"details": "A missing check on incoming client requests can be exploited to cause a situation where the Kea server\u0027s lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2",
"id": "GHSA-qxx9-pw4x-fc72",
"modified": "2024-04-04T02:30:28Z",
"published": "2022-05-24T16:59:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-6474"
},
{
"type": "WEB",
"url": "https://kb.isc.org/docs/cve-2019-6474"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-R45Q-4PF3-VVQC
Vulnerability from github – Published: 2022-05-13 01:44 – Updated: 2025-04-20 03:50In ImageMagick 7.0.7-12 Q16, a memory leak vulnerability was found in the function ReadMATImage in coders/mat.c, which allows attackers to cause a denial of service via a crafted MAT image file.
{
"affected": [],
"aliases": [
"CVE-2017-17881"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-12-27T17:08:00Z",
"severity": "MODERATE"
},
"details": "In ImageMagick 7.0.7-12 Q16, a memory leak vulnerability was found in the function ReadMATImage in coders/mat.c, which allows attackers to cause a denial of service via a crafted MAT image file.",
"id": "GHSA-r45q-4pf3-vvqc",
"modified": "2025-04-20T03:50:34Z",
"published": "2022-05-13T01:44:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-17881"
},
{
"type": "WEB",
"url": "https://github.com/ImageMagick/ImageMagick/issues/878"
},
{
"type": "WEB",
"url": "https://usn.ubuntu.com/3681-1"
}
],
"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-R4WH-WHPG-RC2Q
Vulnerability from github – Published: 2025-11-18 06:30 – Updated: 2025-11-18 06:30Missing Release of Resource after Effective Lifetime (CWE-772) in the T21 Reader allows an attacker with physical access to the Reader to perform a denial-of-service attack against that specific reader, preventing cardholders from badging for entry.
This issue affects Command Centre Server:
9.30 prior to vCR9.30.251028a (distributed in 9.30.2881 (MR3)), 9.20 prior to vCR9.20.251028a (distributed in 9.20.3265 (MR5)), 9.10 prior to vCR9.10.251028a (distributed in 9.10.4135 (MR8)), all versions of 9.00 and prior.
{
"affected": [],
"aliases": [
"CVE-2025-64734"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-11-18T04:15:44Z",
"severity": "LOW"
},
"details": "Missing Release of Resource after Effective Lifetime (CWE-772) in the T21 Reader allows an attacker with physical access to the Reader to perform a denial-of-service attack against that specific reader, preventing cardholders from badging for entry. \n\nThis issue affects Command Centre Server: \n\n9.30 prior to vCR9.30.251028a (distributed in 9.30.2881 (MR3)), 9.20 prior to vCR9.20.251028a (distributed in 9.20.3265 (MR5)), 9.10 prior to vCR9.10.251028a (distributed in 9.10.4135 (MR8)),\u00a0 all versions of 9.00 and prior.",
"id": "GHSA-r4wh-whpg-rc2q",
"modified": "2025-11-18T06:30:25Z",
"published": "2025-11-18T06:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-64734"
},
{
"type": "WEB",
"url": "https://security.gallagher.com/en-NZ/Security-Advisories/CVE-2025-64734"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
}
]
}
GHSA-R53P-PHR7-XVQX
Vulnerability from github – Published: 2022-05-13 01:40 – Updated: 2022-05-13 01:40A denial of service vulnerability in the Android media framework. Product: Android. Versions: 4.4.4, 5.0.2, 5.1.1, 6.0, 6.0.1, 7.0, 7.1.1, 7.1.2. Android ID: A-37239013.
{
"affected": [],
"aliases": [
"CVE-2017-0697"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2017-07-06T20:29:00Z",
"severity": "MODERATE"
},
"details": "A denial of service vulnerability in the Android media framework. Product: Android. Versions: 4.4.4, 5.0.2, 5.1.1, 6.0, 6.0.1, 7.0, 7.1.1, 7.1.2. Android ID: A-37239013.",
"id": "GHSA-r53p-phr7-xvqx",
"modified": "2022-05-13T01:40:31Z",
"published": "2022-05-13T01:40:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-0697"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/2017-07-01"
},
{
"type": "WEB",
"url": "http://www.securityfocus.com/bid/99478"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-R5RG-95PM-C46H
Vulnerability from github – Published: 2022-05-13 01:44 – Updated: 2022-05-13 01:44Huawei AR120-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR1200 V200R006C10, V200R006C13, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR1200-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR150 V200R006C10, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR150-S V200R006C10SPC300, V200R007C00, V200R008C20, V200R008C30, AR160 V200R006C10, V200R006C12, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR200 V200R006C10, V200R007C00, V200R007C01, V200R008C20, V200R008C30, AR200-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR2200 V200R006C10, V200R006C13, V200R006C16PWE, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR2200-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR3200 V200R006C10, V200R006C11, V200R007C00, V200R007C01, V200R007C02, V200R008C00, V200R008C10, V200R008C20, V200R008C30, AR3600 V200R006C10, V200R007C00, V200R007C01, V200R008C20, AR510 V200R006C10, V200R006C12, V200R006C13, V200R006C15, V200R006C16, V200R006C17, V200R007C00SPC180T, V200R008C20, V200R008C30, DP300 V500R002C00, IPS Module V100R001C10SPC200, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, NGFW Module V100R001C10SPC200, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R002C00, V500R002C10, NIP6300 V500R001C00, V500R001C20, V500R001C30, V500R001C50, NIP6600 V500R001C00, V500R001C20, V500R001C30, V500R001C50, NIP6800 V500R001C50, NetEngine16EX V200R006C10, V200R007C00, V200R008C20, V200R008C30, RSE6500 V500R002C00, SRG1300 V200R006C10, V200R007C00, V200R007C02, V200R008C20, V200R008C30, SRG2300 V200R006C10, V200R007C00, V200R007C02, V200R008C20, V200R008C30, SRG3300 V200R006C10, V200R007C00, V200R008C20, V200R008C30, SVN5600 V200R003C00, V200R003C10, SVN5800 V200R003C00, V200R003C10, SVN5800-C V200R003C00, V200R003C10, SeMG9811 V300R001C01, Secospace USG6300 V100R001C10, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, Secospace USG6500 V100R001C10, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, Secospace USG6600 V100R001C00SPC200, V100R001C10, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, V500R001C60, TE30 V100R001C02, V100R001C10, V500R002C00, V600R006C00, TE40 V500R002C00, V600R006C00, TE50 V500R002C00, V600R006C00, TE60 V100R001C01, V100R001C10, V500R002C00, V600R006C00, TP3106 V100R002C00, TP3206 V100R002C00, V100R002C10, USG6000V V500R001C20, USG9500 V500R001C00, V500R001C20, V500R001C30, V500R001C50, USG9520 V300R001C01, V300R001C20, USG9560 V300R001C01, V300R001C20, USG9580 V300R001C01, V300R001C20, VP9660 V500R002C00, V500R002C10, ViewPoint 8660 V100R008C03, ViewPoint 9030 V100R011C02 has a memory leak vulnerability in H323 protocol. An unauthenticated, remote attacker could craft malformed packets and send the packets to the affected products. Due to insufficient verification of the packets, successful exploit could cause a memory leak and eventual denial of service (DoS) condition.
{
"affected": [],
"aliases": [
"CVE-2017-17257"
],
"database_specific": {
"cwe_ids": [
"CWE-772"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2018-04-24T15:29:00Z",
"severity": "HIGH"
},
"details": "Huawei AR120-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR1200 V200R006C10, V200R006C13, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR1200-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR150 V200R006C10, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR150-S V200R006C10SPC300, V200R007C00, V200R008C20, V200R008C30, AR160 V200R006C10, V200R006C12, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR200 V200R006C10, V200R007C00, V200R007C01, V200R008C20, V200R008C30, AR200-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR2200 V200R006C10, V200R006C13, V200R006C16PWE, V200R007C00, V200R007C01, V200R007C02, V200R008C20, V200R008C30, AR2200-S V200R006C10, V200R007C00, V200R008C20, V200R008C30, AR3200 V200R006C10, V200R006C11, V200R007C00, V200R007C01, V200R007C02, V200R008C00, V200R008C10, V200R008C20, V200R008C30, AR3600 V200R006C10, V200R007C00, V200R007C01, V200R008C20, AR510 V200R006C10, V200R006C12, V200R006C13, V200R006C15, V200R006C16, V200R006C17, V200R007C00SPC180T, V200R008C20, V200R008C30, DP300 V500R002C00, IPS Module V100R001C10SPC200, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, NGFW Module V100R001C10SPC200, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R002C00, V500R002C10, NIP6300 V500R001C00, V500R001C20, V500R001C30, V500R001C50, NIP6600 V500R001C00, V500R001C20, V500R001C30, V500R001C50, NIP6800 V500R001C50, NetEngine16EX V200R006C10, V200R007C00, V200R008C20, V200R008C30, RSE6500 V500R002C00, SRG1300 V200R006C10, V200R007C00, V200R007C02, V200R008C20, V200R008C30, SRG2300 V200R006C10, V200R007C00, V200R007C02, V200R008C20, V200R008C30, SRG3300 V200R006C10, V200R007C00, V200R008C20, V200R008C30, SVN5600 V200R003C00, V200R003C10, SVN5800 V200R003C00, V200R003C10, SVN5800-C V200R003C00, V200R003C10, SeMG9811 V300R001C01, Secospace USG6300 V100R001C10, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, Secospace USG6500 V100R001C10, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, Secospace USG6600 V100R001C00SPC200, V100R001C10, V100R001C20, V100R001C30, V500R001C00, V500R001C20, V500R001C30, V500R001C50, V500R001C60, TE30 V100R001C02, V100R001C10, V500R002C00, V600R006C00, TE40 V500R002C00, V600R006C00, TE50 V500R002C00, V600R006C00, TE60 V100R001C01, V100R001C10, V500R002C00, V600R006C00, TP3106 V100R002C00, TP3206 V100R002C00, V100R002C10, USG6000V V500R001C20, USG9500 V500R001C00, V500R001C20, V500R001C30, V500R001C50, USG9520 V300R001C01, V300R001C20, USG9560 V300R001C01, V300R001C20, USG9580 V300R001C01, V300R001C20, VP9660 V500R002C00, V500R002C10, ViewPoint 8660 V100R008C03, ViewPoint 9030 V100R011C02 has a memory leak vulnerability in H323 protocol. An unauthenticated, remote attacker could craft malformed packets and send the packets to the affected products. Due to insufficient verification of the packets, successful exploit could cause a memory leak and eventual denial of service (DoS) condition.",
"id": "GHSA-r5rg-95pm-c46h",
"modified": "2022-05-13T01:44:20Z",
"published": "2022-05-13T01:44:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2017-17257"
},
{
"type": "WEB",
"url": "http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20171227-01-h323-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:H",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-3
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
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
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.