CVE-2016-0736 (GCVE-0-2016-0736)
Vulnerability from cvelistv5 – Published: 2017-07-27 21:00 – Updated: 2024-09-16 17:52
VLAI
EPSS
VEX
Summary
In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.
Severity
7.5 (High)
CWE
- Padding Oracle Attack
Assigner
References
27 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.0 to 2.4.23
|
guessed |
Date Public
2016-12-20 00:00
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"assignerShortName": "apache",
"cveId": "CVE-2016-0736",
"datePublished": "2017-07-27T21:00:00.000Z",
"dateReserved": "2015-12-16T00:00:00.000Z",
"dateUpdated": "2024-09-16T17:52:49.825Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2016-0736",
"date": "2026-09-16",
"epss": "0.49024",
"percentile": "0.98819"
},
"fkie_nvd": {
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"descriptions": "[{\"lang\": \"en\", \"value\": \"In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.\"}, {\"lang\": \"es\", \"value\": \"En Apache HTTP Server versiones 2.4.0 hasta 2.4.23, mod_session_crypto fue cifraba su cookie y datos utilizando los cifrados configurados posiblemente con los modos de operaci\\u00f3n CBC o ECB (AES256-CBC por defecto), por lo tanto, no se puede seleccionar ni crear cifrado autenticado integrado. Esto lo hizo vulnerable a los ataques de tipo or\\u00e1culo de relleno (padding oracle), particularmente con CBC.\"}]",
"id": "CVE-2016-0736",
"lastModified": "2024-11-21T02:42:16.817",
"metrics": "{\"cvssMetricV30\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:P/I:N/A:N\", \"baseScore\": 5.0, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"PARTIAL\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"NONE\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 10.0, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
"published": "2017-07-27T21:29:00.177",
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\"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://security.gentoo.org/glsa/201701-36\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20180423-0001/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://support.apple.com/HT208221\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.exploit-db.com/exploits/40961/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://www.tenable.com/security/tns-2017-04\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-310\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2016-0736\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2017-07-27T21:29:00.177\",\"lastModified\":\"2026-05-13T00:24:29.033\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.\"},{\"lang\":\"es\",\"value\":\"En Apache HTTP Server versiones 2.4.0 hasta 2.4.23, mod_session_crypto fue cifraba su cookie y datos utilizando los cifrados configurados posiblemente con los modos de operaci\u00f3n CBC o ECB (AES256-CBC por defecto), por lo tanto, no se puede seleccionar ni crear cifrado autenticado integrado. Esto lo hizo vulnerable a los ataques de tipo or\u00e1culo de relleno (padding oracle), particularmente con CBC.\"}],\"metrics\":{\"cvssMetricV30\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.0\",\"vectorString\":\"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:N/A:N\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-310\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"BDC40E89-2D57-4988-913E-024BFB56B367\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"6FCD3C8C-9BF8-4F30-981A-593EEAEB9EDD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"046487A3-752B-4D0F-8984-96486B828EAB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"89D2E052-51CD-4B57-A8B8-FAE51988D654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8FEAB0DF-04A9-4F99-8666-0BADC5D642B8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7D924D1-8A36-4C43-9E56-52814F9A6350\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.8:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DFA089AB-AF28-4AE1-AE39-6D1B8192A3DF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"39CDFECC-E26D-47E0-976F-6629040B3764\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E3ECBCB1-0675-41F5-857B-438F36925F63\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"CB6CBFBF-74F6-42AF-BC79-AA53EA75F00B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.14:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"69CB1C41-0360-44D0-B73A-273B0DDE46D5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.16:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8717A96B-9DB5-48D6-A2CF-A5E2B26AF3F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.19:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2AE538EE-7152-4DB5-AE45-614494CB7B95\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B803D25B-0A19-4569-BA05-09D58F33917C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.21:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"BE253E49-9A56-49C8-B1D8-E23BB3D5D1D7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.22:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE5A73E5-1A04-420B-92B2-B90FD970005C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"8510442C-212F-4013-85FA-E0AB59F6F2C6\"}]}]}],\"references\":[{\"url\":\"http://rhn.redhat.com/errata/RHSA-2017-1415.html\",\"source\":\"security@apache.org\"},{\"url\":\"http://www.debian.org/security/2017/dsa-3796\",\"source\":\"security@apache.org\"},{\"url\":\"http://www.securityfocus.com/bid/95078\",\"source\":\"security@apache.org\",\"tags\":[\"Third 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-04T21:58:03+00:00",
"cve": "CVE-2016-0736",
"id": "CVE-2016-0736",
"initial_release_date": "2016-12-20T00:00:00+00:00",
"product_status:fixed": "201",
"product_status:known_affected": "1",
"product_status:known_not_affected": "22",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "httpd: Padding Oracle in Apache mod_session_crypto",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-0736.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-07-26T01:06:20Z",
"cve": "CVE-2016-0736",
"id": "CVE-2016-0736",
"initial_release_date": "2023-02-15T05:09:21Z",
"product_status:known_affected": "86",
"product_status:known_not_affected": "38",
"product_status:recommended": "415",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2016-0736",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-0736.json",
"version": "16"
}
}
}
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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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