The read_request_line function in server/protocol.c in the Apache HTTP Server 2.4.12 does not initialize the protocol structure member, which allows remote attackers to cause a denial of service (NULL pointer dereference and process crash) by sending a request that lacks a method to an installation that enables the INCLUDES filter and has an ErrorDocument 400 directive specifying a local URI.
CVE-2015-0253
MEDIUMCVSS v2 · 5.05.0—Elevated
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 13.0% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.
Sources: epss, nvd_v2
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 13%CVSS v2: 5.0Exploit: Elevated riskExposed services: —
A fix is available — apply it.
Internet exposure
The internet-exposure footprint is temporarily unavailable — the KEV-Exposure radar's record for this CVE could not be loaded just now. That is not a finding of zero exposed services; please retry shortly.
- CVSS v2.0 (legacy)
- 5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 5.0MEDIUMlow confidence
- EG Risk
- 43EG Risk 43/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity50% × 45%Exploitation40% × 40%Automatability30% × 15%CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 13%
- EPSS %ILE
- 96th
- KEV
- Not listed
CISA SSVCTrack at low, Track or Track* at medium and Track* or Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
July 20, 2015
Last Modified
May 6, 2026
Advisory Details (1)
0
NONE
2015-07-20 23:59:00.067+00
Affected: [{"url": "http://httpd.apache.org/security/vulnerabilities_24.html", "tags": ["Vendor Advisory"], "source": "[email protected]"}, {"url": "http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html", "tags": ["Mailing List"], "source": "[email protected]"}, {"url": "http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html", "tags": ["Mailing List"], "source": "[email protected]"}, {"url": "http://rhn.redhat.com/errata/RHSA-2015-1666.html", "source": "[email protected]"}, {"url": "http://www.apache.org/dist/httpd/CHANGES_2.4", "tags": ["Release Notes", "Vendor Advisory"], "source": "[email protected]"}, {"url": "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html", "tags": ["Third Party Advisory"], "source": "[email protected]"}, {"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html", "tags": ["Third Party Advisory"], "source": "[email protected]"}, {"url": "http://www.securityfocus.com/bid/75964", "source": "[email protected]"}, {"url": "http://www.securitytracker.com/id/1032967", "source": "[email protected]"}, {"url": "https://bz.apache.org/bugzilla/show_bug.cgi?id=57531", "tags": ["Issue Tracking"], "source": "[email protected]"}, {"url": "https://github.com/apache/httpd/commit/6a974059190b8a0c7e499f4ab12fe108127099cb", "source": "[email protected]"}, {"url": "https://github.com/apache/httpd/commit/be0f5335e3e73eb63253b050fdc23f252f5c8ae3", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/r83109088737656fa6307bd99ab40f8ff0269ae58d3f7272d7048494a%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/ra7f6aeb28661fbf826969526585f16856abc4615877875f9d3b35ef4%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E", "source": "[email protected]"}, {"url": "https://support.apple.com/HT205219", "tags": ["Third Party Advisory"], "source": "[email protected]"}, {"url": "https://support.apple.com/kb/HT205031", "tags": ["Third Party Advisory"], "source": "[email protected]"}, {"url": "http://httpd.apache.org/security/vulnerabilities_24.html", "tags": ["Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html", "tags": ["Mailing List"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html", "tags": ["Mailing List"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://rhn.redhat.com/errata/RHSA-2015-1666.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.apache.org/dist/httpd/CHANGES_2.4", "tags": ["Release Notes", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.securityfocus.com/bid/75964", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.securitytracker.com/id/1032967", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://bz.apache.org/bugzilla/show_bug.cgi?id=57531", "tags": ["Issue Tracking"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/apache/httpd/commit/6a974059190b8a0c7e499f4ab12fe108127099cb", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/apache/httpd/commit/be0f5335e3e73eb63253b050fdc23f252f5c8ae3", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/r83109088737656fa6307bd99ab40f8ff0269ae58d3f7272d7048494a%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/ra7f6aeb28661fbf826969526585f16856abc4615877875f9d3b35ef4%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://support.apple.com/HT205219", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://support.apple.com/kb/HT205031", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}]
The read_request_line function in server/protocol.c in the Apache HTTP Server 2.4.12 does not initialize the protocol structure member, which allows remote attackers to cause a denial of service (NULL pointer dereference and process crash) by sending a request that lacks a method to an installation that enables the INCLUDES filter and has an ErrorDocument 400 directive specifying a local URI.Vendor Advisories for CVE-2015-0253
Vendor advisories for this CVE are temporarily unavailable — the list could not be loaded just now. That is not a sign that none exist; please retry shortly.
Patch Availability(1)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | RHSA-2015:1666 @ RHSA-2015:1666 — Low (fixes https://access.redhat.com/errata/RHSA-2015:1666) | — | 2015-07-15 00:00:00+00 |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Publicly available exploits
(1 reference)Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
- redhathttps://access.redhat.com/errata/RHSA-2015:1666First seen May 23, 2026
2015-08-24 00:00:00+00
Open source ↗
Related CVEs(same vendor)
Same vendor
3 shownredhat:RHSA-2015:1666
Frequently asked(4)
What is CVE-2015-0253?
CVE-2015-0253 is a medium vulnerability published on July 20, 2015. The readrequestline function in server/protocol.c in the Apache HTTP Server 2.4.12 does not initialize the protocol structure member, which allows remote attackers to cause a denial of service (NULL pointer dereference and process crash) by sending a request that lacks a method to an installation…
When was CVE-2015-0253 disclosed?
CVE-2015-0253 was first published on July 20, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-0253 actively exploited?
CVE-2015-0253 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13% probability of exploitation in the next 30 days (96th percentile of EPSS-scored CVEs).
How do I remediate CVE-2015-0253?
A fix for CVE-2015-0253 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2015-0253
Is Your Infrastructure Affected by CVE-2015-0253?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.