CVE-2018-1312: apache software foundation apache http server Improper Authentication
Vulnerability summary
CVE-2018-1312 is a critical (CVSS 9.8) Improper Authentication vulnerability in apache software foundation apache http server. EPSS estimates a 15.72% chance of exploitation in the next 30 days, higher than 96.8% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 16% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 12 · Related 7Timeline
- 26-03-2018PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
In Apache httpd 2.2.0 to 2.4.29, when generating an HTTP Digest authentication challenge, the nonce sent to prevent reply attacks was not correctly generated using a pseudo-random seed. In a cluster of servers using a common Digest authentication configuration, HTTP requests could be replayed across servers by an attacker without detection.
CVSS metrics
7 scores · 5 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
15.72%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
No change 0.00 pp
From 15.72% 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.
Redhat16 products
- enterprise_linux_desktop7.0
- enterprise_linux_eus7.6
- enterprise_linux_server7.0
- enterprise_linux_server_aus7.6
- enterprise_linux_server_tus7.6
Netapp3 products
Debian2 products
- apache2< 2.4.33-1
- debian_linuxEOL7.0 | 8.0 | 9.0
Alpine1 product
- apache2< 2.4.33-r0
Apache1 product
- http_server2.4.1 | 2.4.2 | 2.4.3 | 2.4.4 | 2.4.6 | 2.4.7 | 2.4.9 | 2.4.10 | 2.4.12 | 2.4.16 | 2.4.17 | 2.4.18 | 2.4.20 | 2.4.23 | 2.4.25 | 2.4.26 | 2.4.27 | 2.4.28 | 2.4.29
Apache software foundation1 product
- apache http server2.0.42 to 2.4.29
Canonical1 product
- ubuntu_linuxEOL12.04 | 14.04 | 16.04 | 17.10 | 18.04
Ubuntu1 product
- apache2< 2.4.7-1ubuntu4.20 | < 2.4.18-2ubuntu3.8 | < 2.4.29-1ubuntu4.1
8 vendors · 26 products
References
41 links
- support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_usX Refsource CONFIRMThird Party Advisory
- www.openwall.com/lists/oss-security/2018/03/24/7Mailing ListX Refsource MLISTThird Party AdvisoryREPORT
Show all 41 references
- lists.debian.org/debian-lts-announce/2018/05/msg00020.htmlMailing ListX Refsource MLISTThird Party Advisory
- access.redhat.com/errata/RHSA-2019:1898Vendor AdvisoryX Refsource REDHATThird Party AdvisoryAdvisory
