Cyber Resilience

CVE-2019-0211

Memory Safety in Redhat Enterprise Linux Eus 8.1 … 8.8

CISA KEVActive ExploitationEUVD ExploitedPublic PoCMemory Safety
Published
08 April 2019
Modified
27 October 2025
KEV Added
03 November 2021
Patch / advisory
View advisory
CVSS Score v3.1 7.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.65 99.2th percentile
Risk Priority 83 floored blend · peak EPSS

Summary

CVE-2019-0211 is a high-severity Use After Free (CWE-416) vulnerability in Redhat Enterprise Linux Eus. Its CVSS base score is 7.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 0.8% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38 using the event, worker, or prefork MPMs, a use-after-free condition tracked as CWE-416 allows code running in less-privileged child processes or threads, including scripts executed by in-process interpreters, to manipulate the scoreboard and execute arbitrary code with the privileges of the parent process, which is typically root. The flaw is restricted to Unix systems; non-Unix platforms are unaffected. The vulnerability received a CVSS 3.1 base score of 7.8 under the vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

An attacker who can execute code within a worker or script context, such as through a compromised CGI script or in-process module, can leverage the scoreboard to escalate privileges to those of the parent httpd process. Successful exploitation grants full control over the server process, enabling actions such as reading or modifying any file accessible to root and potentially compromising the entire host.

Advisories from OpenSUSE and Slackware, along with exploit references on PacketStorm, point to vendor updates that address the issue in affected packages; administrators are expected to apply the corresponding httpd patches to eliminate the scoreboard manipulation vector.

EU & UK References

Vulnerability Data

In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute arbitrary code with the privileges of the…

more

parent process (usually root) by manipulating the scoreboard. Non-Unix systems are not affected.

CWE(s)
CWE-416
KEV Date Added
03 November 2021

Related Threats

MITRE ATT&CK Enterprise Techniques

T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-1086Same product: Debian Debian Linuxboth on KEV
CVE-2019-2215Same product: Canonical Ubuntu Linuxboth on KEV
CVE-2023-4004Same product: Debian Debian Linux
CVE-2023-4813Same product: Fedoraproject Fedora
CVE-2023-32233Same product: Redhat Enterprise Linux
CVE-2023-3141Same product: Debian Debian Linux
CVE-2023-5178Same product: Redhat Enterprise Linux
CVE-2023-1989Same product: Debian Debian Linux
CVE-2023-3111Same product: Debian Debian Linux
CVE-2021-22901Same product class: NAS / storage appliance

Affected Assets

apache
http server
2.4.17 — 2.4.38
fedoraproject
fedora
28, 29, 30
canonical
ubuntu linux
14.04, 16.04, 18.04, 18.10
debian
debian linux
9.0
opensuse
leap
15.0, 42.3
netapp
oncommand unified manager
all versions
redhat
jboss core services
1.0
redhat
openshift container platform
3.11
redhat
openshift container platform for power
3.11_ppc64le
redhat
software collections
1.0
+17 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 3 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V1.4.3

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly incorporate memory-safety tooling and reviews that prevent most use-after-free defects.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover use-after-free issues via scanning or analysis but do not prevent their introduction.

PR.PS-02 partial match
prevents

Routine patching removes known use-after-free instances after they have been introduced in released software.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development can detect use-after-free bugs before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates memory-safety practices that reduce use-after-free defects.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify memory-management rules that mitigate use-after-free.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include memory-safety design choices that limit use-after-free exposure.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly prescribe avoidance of use-after-free patterns.

A.8.32 Change management partial match
prevents

Change-management processes help ensure memory-safety fixes are deployed consistently.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (1 rule)
  • V-248592 OL 8 must clear memory when it is freed to prevent use-after-free attacks. prevents CWE-416
RHEL 8 (1 rule)
  • V-230279 RHEL 8 must clear memory when it is freed to prevent use-after-free attacks. prevents CWE-416
RHEL 9 (1 rule)
  • V-257794 RHEL 9 must clear memory when it is freed to prevent use-after-free attacks. prevents CWE-416

References