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OESA-2021-1246 (CVE-2021-26691)
Vulnerability from osv_openeuler – Published: 2021-06-26 11:04 – Updated: 2026-08-06 11:04 – Source website
VLAI
Summary
httpd security update
Details
Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.
Security Fix(es):
In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow(CVE-2021-26691)
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service(CVE-2020-13950)
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow(CVE-2020-35452)
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with MergeSlashes OFF(CVE-2021-30641)
Severity
7.5 (High)
References
{
"affected": [
{
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},
"details": "Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.\r\n\r\nSecurity Fix(es):\r\n\r\nIn Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow(CVE-2021-26691)\r\n\r\nApache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service(CVE-2020-13950)\r\n\r\nApache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow(CVE-2020-35452)\n\nApache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with MergeSlashes OFF(CVE-2021-30641)",
"id": "OESA-2021-1246",
"modified": "2026-08-06T11:04:29Z",
"published": "2021-06-26T11:04:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1246"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-26691"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-13950"
},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-35452"
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{
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"schema_version": "1.7.2",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "httpd security update",
"upstream": [
"CVE-2021-26691",
"CVE-2020-13950",
"CVE-2020-35452",
"CVE-2021-30641"
]
}
CVE-2020-13950 (GCVE-0-2020-13950)
Vulnerability from cvelistv5 – Published: 2021-06-10 07:10 – Updated: 2024-08-04 12:32
VLAI
EPSS
VEX
Title
mod_proxy_http NULL pointer dereference
Summary
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
Severity
No CVSS data available.
CWE
- mod_proxy_http NULL pointer dereference
Assigner
References
10 references
| URL | Tags |
|---|---|
| http://httpd.apache.org/security/vulnerabilities_… | x_refsource_MISC |
| https://lists.apache.org/thread.html/re026d3da9d7… | x_refsource_MISC |
| https://lists.apache.org/thread.html/rbe197409ae4… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r7f2b70b6216… | mailing-listx_refsource_MLIST |
| http://www.openwall.com/lists/oss-security/2021/06/10/4 | mailing-listx_refsource_MLIST |
| https://security.gentoo.org/glsa/202107-38 | vendor-advisoryx_refsource_GENTOO |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021070… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.46
Affected: 2.4.43 Affected: 2.4.41 |
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CVE-2020-35452 (GCVE-0-2020-35452)
Vulnerability from cvelistv5 – Published: 2021-06-10 07:10 – Updated: 2024-08-04 17:02
VLAI
EPSS
VEX
Title
mod_auth_digest possible stack overflow by one nul byte
Summary
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow
Severity
No CVSS data available.
CWE
- mod_auth_digest possible stack overflow by one nul byte
Assigner
References
12 references
| URL | Tags |
|---|---|
| http://httpd.apache.org/security/vulnerabilities_… | x_refsource_MISC |
| https://lists.apache.org/thread.html/re026d3da9d7… | x_refsource_MISC |
| https://lists.apache.org/thread.html/rccb1b822558… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r7f2b70b6216… | mailing-listx_refsource_MLIST |
| http://www.openwall.com/lists/oss-security/2021/06/10/5 | mailing-listx_refsource_MLIST |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2021/dsa-4937 | vendor-advisoryx_refsource_DEBIAN |
| https://security.gentoo.org/glsa/202107-38 | vendor-advisoryx_refsource_GENTOO |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021070… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.46
Affected: 2.4.43 Affected: 2.4.41 Affected: 2.4.39 Affected: 2.4.38 Affected: 2.4.37 Affected: 2.4.35 Affected: 2.4.34 Affected: 2.4.33 Affected: 2.4.29 Affected: 2.4.28 Affected: 2.4.27 Affected: 2.4.26 Affected: 2.4.25 Affected: 2.4.23 Affected: 2.4.20 Affected: 2.4.18 Affected: 2.4.17 Affected: 2.4.16 Affected: 2.4.12 Affected: 2.4.10 Affected: 2.4.9 Affected: 2.4.7 Affected: 2.4.6 Affected: 2.4.4 Affected: 2.4.3 Affected: 2.4.2 Affected: 2.4.1 Affected: 2.4.0 |
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CVE-2021-26691 (GCVE-0-2021-26691)
Vulnerability from cvelistv5 – Published: 2021-06-10 07:10 – Updated: 2024-08-03 20:33
VLAI
EPSS
VEX
Title
Apache HTTP Server mod_session response handling heap overflow
Summary
In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow
Severity
No CVSS data available.
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
13 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.46
Affected: 2.4.43 Affected: 2.4.41 Affected: 2.4.39 Affected: 2.4.38 Affected: 2.4.37 Affected: 2.4.35 Affected: 2.4.34 Affected: 2.4.33 Affected: 2.4.29 Affected: 2.4.28 Affected: 2.4.27 Affected: 2.4.26 Affected: 2.4.25 Affected: 2.4.23 Affected: 2.4.20 Affected: 2.4.18 Affected: 2.4.17 Affected: 2.4.16 Affected: 2.4.12 Affected: 2.4.10 Affected: 2.4.9 Affected: 2.4.7 Affected: 2.4.6 Affected: 2.4.4 Affected: 2.4.3 Affected: 2.4.2 Affected: 2.4.1 Affected: 2.4.0 |
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CVE-2021-30641 (GCVE-0-2021-30641)
Vulnerability from cvelistv5 – Published: 2021-06-10 07:10 – Updated: 2024-08-03 22:40
VLAI
EPSS
VEX
Title
Unexpected URL matching with 'MergeSlashes OFF'
Summary
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
Severity
No CVSS data available.
CWE
- Unexpected URL matching with 'MergeSlashes OFF'
Assigner
References
12 references
| URL | Tags |
|---|---|
| http://httpd.apache.org/security/vulnerabilities_… | x_refsource_MISC |
| https://lists.apache.org/thread.html/re026d3da9d7… | x_refsource_MISC |
| https://lists.apache.org/thread.html/r2b4773944d8… | mailing-listx_refsource_MLIST |
| https://lists.apache.org/thread.html/r7f2b70b6216… | mailing-listx_refsource_MLIST |
| http://www.openwall.com/lists/oss-security/2021/06/10/8 | mailing-listx_refsource_MLIST |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2021/dsa-4937 | vendor-advisoryx_refsource_DEBIAN |
| https://security.gentoo.org/glsa/202107-38 | vendor-advisoryx_refsource_GENTOO |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021070… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.46
Affected: 2.4.43 Affected: 2.4.41 Affected: 2.4.39 |
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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