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CVE Record

CVE-2023-4527: Glibc: stack read overflow in getaddrinfo in no-aaaa mode

A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

This is a glibc resolver flaw that can expose limited stack data or crash affected systems in a narrow DNS configuration. Business risk is moderate because exploitation requires no-aaaa resolver mode and unusually large DNS-over-TCP responses, but glibc is foundational and outages can affect many Linux workloads. Most likely exposure is Linux systems with affected glibc packages and no-aaaa resolver mode enabled. The bundle names Red Hat Enterprise Linux 8 and 9 glibc versions as affected, while RHEL 6 and 7 glibc entries are listed unaffected. Other vendor advisories exist, but exact affected versions are not provided here. Treat this as a scheduled security update with focused urgency for Linux fleets using no-aaaa DNS settings. It does not justify emergency response without exposure evidence, but delayed patching leaves core infrastructure exposed to crash risk and possible information leakage. Mitigation focus: Apply vendor glibc security updates referenced by your Linux distribution advisories.; Check vendor guidance before changing resolver behavior in production.; Identify systems using no-aaaa resolver mode and prioritize them for review..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-121: Exact CWE lookup

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cve · low confidence lookup

CVE-2023-4527 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
3ADP providers
12Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.5CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H2.24.2redhat

Vulnerability scoring details

Base CVSS 3.1 score

6.5Medium
CVSS 3.1 vector shape for CVE-2023-4527Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Reported to Red Hat.

  2. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  3. Source timelineredhat

    Made public.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Enterprise Linux 8glibc, 0:2.28-225.el8_8.6affected
Red HatRed Hat Enterprise Linux 8glibc, 0:2.28-225.el8_8.6affected
Red HatRed Hat Enterprise Linux 9glibc, 0:2.34-60.el9_2.7affected
Red HatRed Hat Enterprise Linux 9glibc, 0:2.34-60.el9_2.7affected
Red HatRed Hat Enterprise Linux 6compat-glibcunaffected
Red HatRed Hat Enterprise Linux 6glibcunaffected
Red HatRed Hat Enterprise Linux 7compat-glibcunaffected
Red HatRed Hat Enterprise Linux 7glibcunaffected
Weakness

CWE details

CWE-121

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-121 · source CWE mapping

Stack-based Buffer Overflow

Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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