CVE-2017-7668: apache software foundation apache http server Buffer Over-read
Vulnerability summary
CVE-2017-7668 is a high (CVSS 7.5) Buffer Over-read vulnerability in apache software foundation apache http server. EPSS estimates a 57.47% chance of exploitation in the next 30 days, higher than 99% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 57% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 2Timeline
- 20-06-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
57.47%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 57.47% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linux_desktop7.0
- enterprise_linux_eus7.2 | 7.3 | 7.4 | 7.5 | 7.6 | 7.7
- enterprise_linux_server7.0
- enterprise_linux_server_aus7.2 | 7.3 | 7.4 | 7.6 | 7.7
- enterprise_linux_server_tus7.2 | 7.3 | 7.4 | 7.6 | 7.7
Netapp3 products
Debian2 products
- apache2< 2.4.25-4
- debian_linuxEOL8.0 | 9.0
Alpine1 product
- apache2< 2.4.26-r0
Apache1 product
- http_serverEOL2.2.32 | 2.4.24 | 2.4.25
Apache software foundation1 product
- apache http server2.2.32 | 2.4.24, 2.4.25
Apple1 product
- mac_os_x< 10.13.1 | ≥ 10.11.0, < 10.11.6 | ≥ 10.12.0, < 10.12.6 | 10.11.6 | 10.11.6:security_update_2016-001 | 10.11.6:security_update_2016-002 | 10.11.6:security_update_2016-003 | 10.11.6:security_update_2017-001 | 10.11.6:security_update_2017-002 | 10.11.6:security_update_2017-003 | 10.12.6
Oracle1 product
Ubuntu1 product
- apache2< 2.4.7-1ubuntu4.16 | < 2.4.18-2ubuntu3.3
9 vendors · 17 products
References
42 links- support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03908en_usX Refsource CONFIRMThird Party Advisory
- support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03821en_usX Refsource CONFIRMThird Party Advisory
- www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlX Refsource CONFIRMPatchThird Party Advisory
