httpd: Apache HTTP Request Parsing Whitespace Defects
Published Jul 27, 2017
7.5
HIGHCVSS 3.1
EPSS 13.25%
Description
Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accepted from requests and sent in response lines and headers. Accepting these different behaviors represented a security concern when httpd participates in any chain of proxies or interacts with back-end application servers, either through mod_proxy or using conventional CGI mechanisms, and may result in request smuggling, response splitting and cache pollution.
Affected products
-
- Version 2.2.0 to 2.2.31, 2.4.1 to 2.4.23StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | n/a |
|
Configuration 1
- ≥ 2.2.0 · ≤ 2.2.31
- ≥ 2.4.1 · ≤ 2.4.23
Configuration 2
- n/a
- n/a
Configuration 3
- 8.0
- 9.0
Configuration 4
- 6.0
- 7.0
- 7.3
- 7.4
- 7.5
- 7.6
- 7.7
- 6.0
- 7.0
- 7.3
- 7.4
- 7.6
- 7.7
- 7.3
- 7.6
- 7.7
- 6.0
- 7.0
Configuration 5
- 1.0
Running on/with
- 6.0
- 7.0
No data.
JBoss Core Services on RHEL 6
jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el6
Fixed · RHSA-2017:1414
JBoss Core Services on RHEL 6
jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el6
Fixed · RHSA-2017:1414
JBoss Core Services on RHEL 6
jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6
Fixed · RHSA-2017:1414
JBoss Core Services on RHEL 7
jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el7
Fixed · RHSA-2017:1413
JBoss Core Services on RHEL 7
jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el7
Fixed · RHSA-2017:1413
JBoss Core Services on RHEL 7
jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7
Fixed · RHSA-2017:1413
Red Hat Enterprise Linux 6
httpd-0:2.2.15-60.el6_9.4
Fixed · RHSA-2017:1721
Red Hat Enterprise Linux 7
httpd-0:2.4.6-45.el7_3.4
Fixed · RHSA-2017:0906
Red Hat JBoss Core Services
n/a
Fixed · RHSA-2017:1415
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-httpd-0:2.4.25-9.el6
Fixed · RHSA-2017:1161
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
httpd24-httpd-0:2.4.25-9.el6
Fixed · RHSA-2017:1161
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-httpd-0:2.4.25-9.el7
Fixed · RHSA-2017:1161
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
httpd24-httpd-0:2.4.25-9.el7
Fixed · RHSA-2017:1161
Red Hat Directory Server 8
httpd
Not affected
Red Hat Enterprise Linux 5
httpd
Will not fix
Red Hat JBoss Enterprise Application Platform 5
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 6
httpd22
Affected
Red Hat JBoss Enterprise Web Server 1
httpd
Will not fix
Red Hat JBoss Enterprise Web Server 2
httpd22
Will not fix
Red Hat JBoss Web Server 3
httpd24
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| JBoss Core Services on RHEL 6 | jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el6 | Fixed | RHSA-2017:1414 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el6 | Fixed | RHSA-2017:1414 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6 | Fixed | RHSA-2017:1414 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el7 | Fixed | RHSA-2017:1413 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el7 | Fixed | RHSA-2017:1413 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7 | Fixed | RHSA-2017:1413 |
| Red Hat Enterprise Linux 6 | httpd-0:2.2.15-60.el6_9.4 | Fixed | RHSA-2017:1721 |
| Red Hat Enterprise Linux 7 | httpd-0:2.4.6-45.el7_3.4 | Fixed | RHSA-2017:0906 |
| Red Hat JBoss Core Services | n/a | Fixed | RHSA-2017:1415 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-httpd-0:2.4.25-9.el6 | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | httpd24-httpd-0:2.4.25-9.el6 | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-httpd-0:2.4.25-9.el7 | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | httpd24-httpd-0:2.4.25-9.el7 | Fixed | RHSA-2017:1161 |
| Red Hat Directory Server 8 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 5 | httpd | Will not fix | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | httpd22 | Affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | httpd | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd22 | Will not fix | n/a |
| Red Hat JBoss Web Server 3 | httpd24 | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (45 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 13.25% (0.13252) | 96.27th | v5 (v2026.06.15) |
| Jun 15, 2026 | 13.25% (0.13252) | 95.88th | v5 (v2026.06.15) |
| May 13, 2026 | 10.64% (0.10637) | 93.37th | v4 (v2025.03.14) |
| Mar 4, 2026 | 8.41% (0.08406) | 92.17th | v4 (v2025.03.14) |
| Mar 1, 2026 | 3.39% (0.03392) | 87.23th | v4 (v2025.03.14) |
| Feb 4, 2026 | 8.41% (0.08406) | 92.10th | v4 (v2025.03.14) |
| Feb 1, 2026 | 3.39% (0.03392) | 87.15th | v4 (v2025.03.14) |
| Jan 4, 2026 | 8.62% (0.08615) | 92.15th | v4 (v2025.03.14) |
| Jan 1, 2026 | 3.48% (0.03483) | 87.28th | v4 (v2025.03.14) |
| Dec 28, 2025 | 8.62% (0.08615) | 92.13th | v4 (v2025.03.14) |
| Dec 27, 2025 | 5.67% (0.05670) | 90.14th | v4 (v2025.03.14) |
| Dec 4, 2025 | 8.41% (0.08406) | 91.97th | v4 (v2025.03.14) |
| Dec 1, 2025 | 3.39% (0.03392) | 87.03th | v4 (v2025.03.14) |
| Nov 4, 2025 | 8.41% (0.08406) | 91.92th | v4 (v2025.03.14) |
| Nov 1, 2025 | 3.39% (0.03392) | 86.95th | v4 (v2025.03.14) |
| Oct 28, 2025 | 8.41% (0.08406) | 91.92th | v4 (v2025.03.14) |
| Oct 27, 2025 | 5.53% (0.05527) | 89.84th | v4 (v2025.03.14) |
| Oct 4, 2025 | 8.41% (0.08406) | 91.96th | v4 (v2025.03.14) |
| Oct 1, 2025 | 3.39% (0.03392) | 86.98th | v4 (v2025.03.14) |
| Sep 21, 2025 | 5.53% (0.05527) | 89.89th | v4 (v2025.03.14) |
| Sep 4, 2025 | 6.78% (0.06784) | 90.96th | v4 (v2025.03.14) |
| Sep 1, 2025 | 2.31% (0.02311) | 84.24th | v4 (v2025.03.14) |
| Aug 4, 2025 | 6.78% (0.06784) | 90.92th | v4 (v2025.03.14) |
| Aug 1, 2025 | 2.31% (0.02311) | 84.21th | v4 (v2025.03.14) |
| Jul 30, 2025 | 6.78% (0.06784) | 90.91th | v4 (v2025.03.14) |
| Jul 4, 2025 | 10.23% (0.10228) | 92.78th | v4 (v2025.03.14) |
| Jul 1, 2025 | 4.50% (0.04501) | 88.68th | v4 (v2025.03.14) |
| Jun 19, 2025 | 10.23% (0.10228) | 92.76th | v4 (v2025.03.14) |
| Jun 4, 2025 | 11.63% (0.11631) | 93.27th | v4 (v2025.03.14) |
| Jun 1, 2025 | 4.57% (0.04566) | 88.70th | v4 (v2025.03.14) |
| May 4, 2025 | 11.63% (0.11631) | 93.24th | v4 (v2025.03.14) |
| May 1, 2025 | 4.57% (0.04566) | 88.62th | v4 (v2025.03.14) |
| Mar 30, 2025 | 11.63% (0.11631) | 93.02th | v4 (v2025.03.14) |
| Mar 29, 2025 | 8.79% (0.08794) | 87.33th | v4 (v2025.03.14) |
| Mar 26, 2025 | 11.63% (0.11631) | 92.93th | v4 (v2025.03.14) |
| Mar 17, 2025 | 10.23% (0.10228) | 92.56th | v4 (v2025.03.14) |
| Dec 17, 2024 | 5.86% (0.05859) | 93.31th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.27% (0.00270) | 66.91th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.27% (0.00270) | 64.22th | v3 (v2023.03.01) |
| Oct 31, 2023 | 0.57% (0.00575) | 75.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.41% (0.00408) | 69.77th | v3 (v2023.03.01) |
| Mar 6, 2023 | 7.77% (0.07767) | 93.09th | v2 (v2022.01.01) |
| Sep 8, 2022 | 7.77% (0.07767) | 92.81th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.24% (0.05242) | 88.72th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.24% (0.05242) | 75.28th | v2 (v2022.01.01) |
References (45)
- http://rhn.redhat.com/errata/RHSA-2017-1415.html vendor-advisoryx_refsource_REDHATThird Party Advisory
- http://www.debian.org/security/2017/dsa-3796 vendor-advisoryx_refsource_DEBIANThird Party Advisory
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- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r09b8a39d1262adbab5528eea73df1b1f93e919bf004ed5a843d9cad1%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r4fe84db67fe9dc906c6185e58bbd9913f4356dd555a5c3db490694e5%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r94284b139540e5287ebdd3450682d3e3d187263dd6b75af8fa7d4890%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rfcb6c7b9e7ca727a7eeeb5f13f89488a03981cfa0e7c3125f18fa239%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
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Change history (0)
No recorded changes yet.