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CVE Record

CVE-2017-12133: Use-after-free vulnerability in the clntudp_call function in sunrpc/clnt_udp.c in the GNU C Library (aka gl...

Use-after-free vulnerability in the clntudp_call function in sunrpc/clnt_udp.c in the GNU C Library (aka glibc or libc6) before 2.26 allows remote attackers to have unspecified impact via vectors related to error path.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2017-12133 is a memory-safety flaw in GNU C Library's SunRPC UDP client code. The public record says remote attackers may cause unspecified impact through an error-path condition. Because impact details and CVSS are absent, treat it as a dependency hygiene and patching issue, not as confirmed active exploitation.

Executive priority

Prioritize normal security patch management unless local exposure to SunRPC UDP client code is business-critical. The issue affects a foundational library, but public evidence lacks CVSS, confirmed exploitation, and specific impact details.

Technical view

The issue is a use-after-free in clntudp_call in sunrpc/clnt_udp.c in glibc/libc6 before 2.26. The vulnerability is tied to error-path handling. Sourceware has a referenced bug and fixing commit; Fedora and Ubuntu published advisories. No CWE, CVSS vector, or concrete impact is provided in the bundle.

Likely exposure

Likely exposure is Linux systems or software environments using glibc/libc6 before 2.26, especially where SunRPC UDP client functionality is reachable. The source bundle does not identify specific affected products beyond glibc/libc6 and vendor advisories from Fedora and Ubuntu.

Exploitation context

The CVE says remote attackers can have unspecified impact, but the bundle does not include exploit details, proof of active exploitation, or KEV listing. Therefore active exploitation should not be claimed from these sources.

Researcher notes

Key evidence is the CVE description, Sourceware Bugzilla entry, upstream glibc commit, and Fedora/Ubuntu advisories. The public bundle supports a pre-2.26 glibc use-after-free in an error path, but not exploitability mechanics or reliable impact classification.

Mitigation direction

  • Inventory systems and containers using glibc/libc6 versions older than 2.26.
  • Apply relevant OS vendor glibc/libc6 security updates.
  • Check Fedora and Ubuntu advisories for distribution-specific package status.
  • Review Sourceware bug and commit details when validating backported fixes.
  • Prioritize systems using SunRPC UDP client functionality.

Validation and detection

  • Confirm installed glibc/libc6 package versions across Linux assets.
  • Verify vendor package changelogs reference CVE-2017-12133 or the Sourceware fix.
  • Identify applications linked against glibc that use SunRPC UDP client code.
  • Confirm patched packages are deployed after maintenance windows.
  • Document exceptions where vendor guidance is unavailable.
Prepared
Confidence
medium
Sources
7

Public sources used

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2017-12133 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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