CVE-2013-7423

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:P/A:N. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 5.8% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS v2: 5.0Exploit: None knownExposed: 0

A fix is available — apply it.

The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity50% × 45%
Exploitation6% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

February 24, 2015

Last Modified

May 6, 2026

References (22)

Vendor Advisories for CVE-2013-7423(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibc6 (2.11.1-0ubuntu7.21) @ lucid2026-05-28ubuntu
redhatglibc-0:2.12-1.132.el6_5.82016-06-07redhat
redhatglibc-0:2.17-79.ael7b_12015-12-09redhat
redhatglibc-0:2.17-105.el72015-11-19redhat
redhatglibc-0:2.12-1.149.el6_6.72015-04-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
glibc—2.19-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
glibc—2.19-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
glibc—2.19-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
glibc—2.19-1—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
eglibc2.11.2-10 ... 2.11.3-4 (10 versions)2.11.3-4+deb6u5—

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 120 total refreshes for this CVE.

  1. 2026-08-20 22:50 UTCEPSS rescore
  2. 2026-08-19 16:59 UTCEPSS rescore
  3. 2026-08-18 13:43 UTCEPSS rescore
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  18. 2026-07-26 13:49 UTCEG score recompute▲ 5.00
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  20. 2026-07-23 01:11 UTCEG score recompute
  21. 2026-07-23 00:15 UTCEG score recompute
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  24. 2026-07-21 20:18 UTCOSV refresh
  25. 2026-07-21 15:21 UTCEPSS rescore
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  45. 2026-06-16 17:49 UTCEPSS rescore
  46. 2026-06-16 04:09 UTCOSV refresh
  47. 2026-06-15 17:44 UTCEPSS rescore
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Frequently asked(4)

What is CVE-2013-7423?
CVE-2013-7423 is a medium vulnerability published on February 24, 2015. The senddg function in resolv/ressend.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.
When was CVE-2013-7423 disclosed?
CVE-2013-7423 was first published in the National Vulnerability Database on February 24, 2015, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2013-7423 actively exploited?
CVE-2013-7423 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.5% of all scored CVEs.
How do I remediate CVE-2013-7423?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2013-7423, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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