HIGH
httpd: Push diary crash on specifically crafted HTTP/2 header
Published Aug 7, 2020
7.5
HIGHCVSS 3.1
EPSS 88.84%
Description
Apache HTTP Server versions 2.4.20 to 2.4.43. A specially crafted value for the 'Cache-Digest' header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability for unpatched servers.
Affected products
- Vendor n/a Product Apache HTTP Server Defaultn/a
- Version 2.4.20 to 2.4.43StatusaffectedConstraints-
- 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 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Apache HTTP Server | n/a |
|
Configuration 1
- ≥ 2.4.20 · < 2.4.46
Configuration 2
OR
- ≥ 8.2.0 · ≤ 8.2.2
- ≥ 8.2.0 · ≤ 8.2.2
- ≥ 8.2.0 · ≤ 8.2.2
- 12.4.0.0
- 11.1.2.4
- 17.1
- 17.2
- 17.3
- 8.8
Configuration 4
- 10.0
Configuration 5
OR
- 31
- 32
Configuration 6
OR
- 16.04
- 18.04
- 20.04
Configuration 7
AND
- 1.0
Running on/with
OR
- 6.0
- 7.0
- 7.6
- 7.7
Configuration 8
OR
- 16.1
- 16.1
- 8.0
- 8.1
- 8.2
- 8.4
- 8.6
- 8.0
- 8.1
- 8.2
- 8.4
- 8.6
- 8.0
- 8.1
- 8.2
- 8.4
- 8.6
- 8.2
- 8.4
- 8.6
- 8.1
- 8.2
- 8.4
- 8.6
- 8.2
- 8.4
- 8.6
- 8.1
- 8.2
- 8.4
- 8.6
No data.
Red Hat Enterprise Linux 8
httpd:2.4-8020020200824162909.4cda2c84
Fixed · RHSA-2020:3714
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions
httpd:2.4-8000020200825105249.f8e95b4e
Fixed · RHSA-2020:3734
Red Hat Enterprise Linux 8.1 Extended Update Support
httpd:2.4-8010020200824180659.c27ad7f8
Fixed · RHSA-2020:3726
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-httpd-0:2.4.34-18.el6.1
Fixed · RHSA-2020:3733
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-httpd-0:2.4.34-18.el7.1
Fixed · RHSA-2020:3733
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-httpd-0:2.4.34-18.el7.1
Fixed · RHSA-2020:3733
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS
httpd24-httpd-0:2.4.34-18.el7.1
Fixed · RHSA-2020:3733
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 7
httpd
Not affected
Red Hat JBoss Core Services
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | httpd:2.4-8020020200824162909.4cda2c84 | Fixed | RHSA-2020:3714 |
| Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions | httpd:2.4-8000020200825105249.f8e95b4e | Fixed | RHSA-2020:3734 |
| Red Hat Enterprise Linux 8.1 Extended Update Support | httpd:2.4-8010020200824180659.c27ad7f8 | Fixed | RHSA-2020:3726 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-httpd-0:2.4.34-18.el6.1 | Fixed | RHSA-2020:3733 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-httpd-0:2.4.34-18.el7.1 | Fixed | RHSA-2020:3733 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-httpd-0:2.4.34-18.el7.1 | Fixed | RHSA-2020:3733 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | httpd24-httpd-0:2.4.34-18.el7.1 | Fixed | RHSA-2020:3733 |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | httpd | Not affected | n/a |
| Red Hat JBoss Core Services | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
As per upstream this flaw only affects Apache HTTP Server versions 2.4.20 to 2.4.43. Therefore only httpd packages shipped with Red Hat Enterprise Linux 8 are affected.
Red Hat mitigation
Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability.
Metrics
No CVSS v4.0 score for this CVE.
7.5 HIGH NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
No CVSS v3.0 score for this CVE.
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
88.84% 0.88844
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.88844
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (60 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 88.84% (0.88844) | 99.77th | v5 (v2026.06.15) |
| Jun 15, 2026 | 89.74% (0.89744) | 99.77th | v5 (v2026.06.15) |
| May 28, 2026 | 76.28% (0.76276) | 98.95th | v4 (v2025.03.14) |
| May 9, 2026 | 72.86% (0.72857) | 98.80th | v4 (v2025.03.14) |
| Mar 4, 2026 | 76.28% (0.76276) | 98.90th | v4 (v2025.03.14) |
| Mar 1, 2026 | 73.67% (0.73669) | 98.79th | v4 (v2025.03.14) |
| Feb 4, 2026 | 76.28% (0.76276) | 98.89th | v4 (v2025.03.14) |
| Feb 1, 2026 | 73.67% (0.73669) | 98.78th | v4 (v2025.03.14) |
| Jan 4, 2026 | 75.82% (0.75824) | 98.87th | v4 (v2025.03.14) |
| Jan 1, 2026 | 73.17% (0.73165) | 98.75th | v4 (v2025.03.14) |
| Dec 28, 2025 | 75.82% (0.75824) | 98.86th | v4 (v2025.03.14) |
| Dec 27, 2025 | 77.18% (0.77184) | 98.93th | v4 (v2025.03.14) |
| Dec 4, 2025 | 75.82% (0.75824) | 98.85th | v4 (v2025.03.14) |
| Dec 1, 2025 | 73.17% (0.73165) | 98.73th | v4 (v2025.03.14) |
| Nov 21, 2025 | 75.82% (0.75824) | 98.85th | v4 (v2025.03.14) |
| Nov 18, 2025 | 81.29% (0.81293) | 99.25th | v4 (v2025.03.14) |
| Nov 4, 2025 | 75.82% (0.75824) | 98.85th | v4 (v2025.03.14) |
| Nov 1, 2025 | 73.17% (0.73165) | 98.73th | v4 (v2025.03.14) |
| Oct 28, 2025 | 75.82% (0.75824) | 98.85th | v4 (v2025.03.14) |
| Oct 27, 2025 | 77.18% (0.77184) | 98.92th | v4 (v2025.03.14) |
| Oct 4, 2025 | 75.82% (0.75824) | 98.86th | v4 (v2025.03.14) |
| Oct 1, 2025 | 73.17% (0.73165) | 98.75th | v4 (v2025.03.14) |
| Sep 4, 2025 | 77.18% (0.77184) | 98.94th | v4 (v2025.03.14) |
| Sep 1, 2025 | 74.26% (0.74261) | 98.80th | v4 (v2025.03.14) |
| Aug 4, 2025 | 77.18% (0.77184) | 98.92th | v4 (v2025.03.14) |
| Aug 1, 2025 | 74.62% (0.74623) | 98.81th | v4 (v2025.03.14) |
| Jul 30, 2025 | 77.50% (0.77501) | 98.93th | v4 (v2025.03.14) |
| Jul 9, 2025 | 75.82% (0.75824) | 98.84th | v4 (v2025.03.14) |
| Jul 7, 2025 | 72.34% (0.72337) | 98.67th | v4 (v2025.03.14) |
| Jul 4, 2025 | 75.82% (0.75824) | 98.84th | v4 (v2025.03.14) |
| Jul 1, 2025 | 73.17% (0.73165) | 98.72th | v4 (v2025.03.14) |
| Jun 4, 2025 | 75.82% (0.75824) | 98.83th | v4 (v2025.03.14) |
| Jun 1, 2025 | 73.17% (0.73165) | 98.71th | v4 (v2025.03.14) |
| May 4, 2025 | 75.82% (0.75824) | 98.83th | v4 (v2025.03.14) |
| May 1, 2025 | 68.60% (0.68601) | 98.51th | v4 (v2025.03.14) |
| Mar 30, 2025 | 75.82% (0.75824) | 98.85th | v4 (v2025.03.14) |
| Mar 29, 2025 | 82.76% (0.82764) | 99.05th | v4 (v2025.03.14) |
| Mar 26, 2025 | 76.28% (0.76276) | 98.88th | v4 (v2025.03.14) |
| Mar 24, 2025 | 69.97% (0.69971) | 98.59th | v4 (v2025.03.14) |
| Mar 23, 2025 | 76.28% (0.76276) | 98.86th | v4 (v2025.03.14) |
| Mar 17, 2025 | 69.97% (0.69971) | 98.56th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.34% (0.02338) | 89.45th | v3 (v2023.03.01) |
| Jul 14, 2024 | 0.69% (0.00688) | 80.29th | v3 (v2023.03.01) |
| Mar 27, 2024 | 0.61% (0.00606) | 78.12th | v3 (v2023.03.01) |
| Dec 11, 2023 | 0.61% (0.00606) | 76.12th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.72% (0.00721) | 78.37th | v3 (v2023.03.01) |
| Jul 14, 2023 | 8.94% (0.08941) | 93.76th | v3 (v2023.03.01) |
| May 8, 2023 | 9.37% (0.09374) | 93.76th | v3 (v2023.03.01) |
| Apr 23, 2023 | 9.35% (0.09355) | 93.76th | v3 (v2023.03.01) |
| Mar 14, 2023 | 10.51% (0.10514) | 94.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 11.31% (0.11311) | 94.25th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.24% (0.05242) | 89.75th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.24% (0.05242) | 88.72th | v2 (v2022.01.01) |
| Feb 4, 2022 | 34.28% (0.34284) | 96.67th | v2 (v2022.01.01) |
| Feb 3, 2022 | 46.30% (0.46305) | 98.89th | v1 |
| Jan 6, 2022 | 46.30% (0.46305) | 98.87th | v1 |
| Sep 1, 2021 | 16.12% (0.16121) | 97.34th | v1 |
| Jun 8, 2021 | 16.12% (0.16121) | 0.00th | v1 |
| Jun 3, 2021 | 15.67% (0.15665) | 0.00th | v1 |
| Apr 14, 2021 | 15.20% (0.15204) | 0.00th | v1 |
Weaknesses (2)
References (33)
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00068.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00071.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00081.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/160392/Apache-2.4.43-mod_http2-Memory-Corruption.html x_refsource_MISCThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2020-9490 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1866560 Issue Tracking
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2020-9490 x_refsource_MISCVendor Advisory
- https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r0b6541c5fb2f8fb383861333400add7def625bc993300300de0b4f8d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r5debe8f82728a00a4a68bc904dd6c35423bdfc8d601cfb4579f38bf1%40%3Cdev.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r623de9b2b2433a87f3f3a15900419fc9c00c77b26936dfea4060f672%40%3Cdev.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r97d0faab6ed8fd0d439234b16d05d77b22a07b0c4817e7b3cca419cc%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9e485ce5a01c9dc3d4d785a7d28aa7400ead1e81884034ff1f03cfee%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9e9f1a7609760f0f80562eaaec2aa3c32d525c3e0fca98b475240c71%40%3Cdev.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/ra4da876037477c06f2677d7a1e10b5a8613000fca99c813958070fe9%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/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce%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/rfed9fea918e090383da33e393eb6c2755fccf05032bd7d6eb4737c9e%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NKWG2EXAQQB6LMLATKZ7KLSRGCSHVAN/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVFDBVM6E3JF3O7RYLRPRCH3RDRHJJY/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2020-9490
- https://security.gentoo.org/glsa/202008-04 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200814-0005/ x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/4458-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2020-9490
- https://www.debian.org/security/2020/dsa-4757 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2021.html x_refsource_MISCPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISCPatchThird Party Advisory
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Aug 7, 2020
Updated Aug 4, 2024
Reserved Mar 1, 2020
Link CVE-2020-9490
CISA Vulnrichment
Updated n/a