CVE-2016-4437
Confirmed PUBLISHEDApache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary...
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Apache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary code or bypass intended access restrictions via an unspecified request parameter.
- CVE Published
- Jun 07, 2016
- Exploitation Reported
- Nov 03, 2021
- CVSS
- 9.8 Critical
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| n/a |
n/a
|
n/a |
Affected |
CVE References
- RHSA-2016:2035 rhn.redhat.com · Vendor Advisory http://rhn.redhat.com/errata/RHSA-2016-2035.html
- RHSA-2016:2036 rhn.redhat.com · Vendor Advisory http://rhn.redhat.com/errata/RHSA-2016-2036.html
- 91024 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/91024
- [[email protected]] 20171101 Apache Aurora information disclosure vulnerability lists.apache.org · Mailing List https://lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8...
- 20160603 [Announce] CVE-2016-4437: Apache Shiro information disclosure vulnerability securityfocus.com · Mailing List http://www.securityfocus.com/archive/1/538570/100/0/threaded
Show 2 more references
- packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Inform...
- packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote-Code-... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/157497/Apache-Shiro-1.2.4-Remote...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2021-11-03 00:00 UTC |
Scanner Artifacts
Nuclei and Metasploit references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2016/CVE-2016-4437.yaml | Apr 25, 2025 |
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/shiro_rememberme_v124_deserialize.rb | Apr 28, 2025 |
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
Exploitation Status
Exploited in the wild
Recorded 2021-11-03 00:00:00 UTC · CISA
Proof of concept available
Recorded 2021-06-22 06:08:55 UTC · GitHub
Weaknesses (CWE)
-
Use of Hard-coded Cryptographic Key
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Metasploit | https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/shiro_rememberme_v124_deserialize.rb | Apr 28, 2025 |
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2016/CVE-2016-4437.yaml | Apr 25, 2025 |
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2024-01-15 08:24:40 UTC · 0 stars
1.验证CVE-2016-4437、2.解析rememberMe的文件和CBC加密的IV偏移
github · Created 2023-12-22 02:26:01 UTC · 2 stars
Python POC to Exploit CVE-2016-4437 Apache Shiro Deserialization Vulnerability Due to Hardcode Encryption Key
github · Created 2021-06-22 06:08:55 UTC · 0 stars
nuclei · Created Unknown
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
15:02 UTC about 1 year ago15:02 UTC · about 1 year ago
Metasploit module available
Exploit module available
-
00:00 UTC about 1 year ago00:00 UTC · about 1 year ago
Nuclei template available
Scanner coverage available
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
06:08 UTC about 5 years ago06:08 UTC · about 5 years ago
Public PoC available
Public proof-of-concept code published
-
14:00 UTC about 10 years ago14:00 UTC · about 10 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC about 10 years ago00:00 UTC · about 10 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2016-4437
{
"cve_id": "CVE-2016-4437",
"title": "Apache Shiro before 1.2.5, when a cipher key has not been configured for the ...",
"affected_vendor": "Apache",
"affected_product": "Shiro",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 9.8,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}