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Vulnerability details: VCID-292q-gt7d-57h4
Vulnerability ID VCID-292q-gt7d-57h4
Aliases CVE-1999-1199
Summary A serious problem exists when a client sends a large number of headers with the same header name. Apache uses up memory faster than the amount of memory required to simply store the received data itself. That is, memory use increases faster and faster as more headers are received, rather than increasing at a constant rate. This makes a denial of service attack based on this method more effective than methods which cause Apache to use memory at a constant rate, since the attacker has to send less data.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
epss 0.05121 https://api.first.org/data/v1/epss?cve=CVE-1999-1199
apache_httpd important https://httpd.apache.org/security/json/CVE-1999-1199.json
cvssv2 10.0 https://nvd.nist.gov/vuln/detail/CVE-1999-1199
Reference id Reference type URL
http://marc.info/?l=bugtraq&m=90252779826784&w=2
http://marc.info/?l=bugtraq&m=90276683825862&w=2
http://marc.info/?l=bugtraq&m=90280517007869&w=2
http://marc.info/?l=bugtraq&m=90286768232093&w=2
https://api.first.org/data/v1/epss?cve=CVE-1999-1199
https://lists.apache.org/thread.html/r5419c9ba0951ef73a655362403d12bb8d10fab38274deb3f005816f5%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf2f0f3611f937cf6cfb3b4fe4a67f69885855126110e1e3f2fb2728e%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
http://www.redhat.com/support/errata/rh51-errata-general.html#apache
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
CVE-1999-1199 https://httpd.apache.org/security/json/CVE-1999-1199.json
CVE-1999-1199 https://nvd.nist.gov/vuln/detail/CVE-1999-1199
No exploits are available.
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C Found at https://nvd.nist.gov/vuln/detail/CVE-1999-1199
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Exploit Prediction Scoring System (EPSS)
Percentile 0.89811
EPSS Score 0.05121
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:36:11.275235+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-1999-1199.json 38.0.0