High
Security advisory
In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-15710
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:32 UTC · Revision 1
Source evidence
In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.
osv:CVE-2017-15710
Complete source record
{
"id": "0dc167ae8be4e83cdaee2cb7deed7f1db2592043ebc6c3994af4c20af96c6b0a",
"url": "https://osv.dev/vulnerability/CVE-2017-15710",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2017-15710",
"summary": "In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.",
"evidence": "osv:CVE-2017-15710",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2017-15710",
"aliases": [
"CVE-2017-15710"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
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"type": "GIT",
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{
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{
"cpe": "cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:*",
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{
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{
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{
"cpe": "cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*",
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{
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{
"cpe": "cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:apache:http_server:2.4.25:*:*:*:*:*:*:*",
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{
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"versions": [
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"2.4.12",
"2.4.16",
"2.4.17",
"2.4.18",
"2.4.2",
"2.4.20",
"2.4.23",
"2.4.25",
"2.4.26",
"2.4.27",
"2.4.28",
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"2.4.3",
"2.4.4",
"2.4.6",
"2.4.7",
"2.4.9"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-15710.json"
}
}
],
"modified": "2026-10-24T10:30:54.623979798Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%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/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E",
"https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E",
"https://www.tenable.com/security/tns-2019-09",
"https://access.redhat.com/errata/RHSA-2018:3558",
"https://access.redhat.com/errata/RHSA-2019:0366",
"https://access.redhat.com/errata/RHSA-2019:0367",
"https://httpd.apache.org/security/vulnerabilities_24.html",
"https://lists.debian.org/debian-lts-announce/2018/05/msg00020.html",
"https://security.netapp.com/advisory/ntap-20180601-0004/",
"https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us",
"https://usn.ubuntu.com/3627-1/",
"https://usn.ubuntu.com/3627-2/",
"https://usn.ubuntu.com/3937-2/",
"https://www.debian.org/security/2018/dsa-4164"
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"value": "CVE-2017-15710",
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},
"source_id": "core-osv",
"document_id": 438237,
"published_at": "2018-03-26T15:29:00.227+00:00"
}