CVE-2019-18276Gnu Bash
NVDCVSS scored by NVD (NIST)
Vulnerability Summary
An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.
CVSS v3.1 Base Metrics — Score 7.8 (HIGH)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAttack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected & Patched Versions
- Gnu Bash <= 5.0
- Gnu Bash
- Netapp Hci Management Node
- Netapp Oncommand Unified Manager >= 9.5
- Netapp Solidfire
- Oracle Communications Cloud Native Core Policy
No patched version published yet
Until a fix ships, reduce exposure:
- Restrict access to the affected service or interface to trusted networks.
- Disable the affected feature if you do not need it.
- Watch the vendor advisory for a firmware or software update.
What to do
Prioritize this fix. Exploit code is public, so attacks can follow quickly.
- Check whether you run Gnu Bash and which version.
- No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
- Subscribe to the vendor advisory so you learn when a fix ships.
- Review logs and exposed services for signs of earlier compromise.
Timeline
- Nov 28, 2019Published
- Oct 14, 2026Record last modified
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
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Set up CVE alertsExternal References
- Exploithttp://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html
- Patchhttps://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
- Referencehttps://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- Advisoryhttps://security.gentoo.org/glsa/202105-34
- Vendor Advisoryhttps://security.netapp.com/advisory/ntap-20200430-0003/
- Patchhttps://www.oracle.com/security-alerts/cpuapr2022.html
- Exploithttps://www.youtube.com/watch?v=-wGtxJ8opa8
- Exploithttp://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html
- Patchhttps://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
- Referencehttps://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
- Advisoryhttps://security.gentoo.org/glsa/202105-34
- Vendor Advisoryhttps://security.netapp.com/advisory/ntap-20200430-0003/
- Patchhttps://www.oracle.com/security-alerts/cpuapr2022.html
- Exploithttps://www.youtube.com/watch?v=-wGtxJ8opa8
- Referencehttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
Data last checked: Nov 15, 2026 00:23 UTC