CVE-1999-0524

MEDIUMPre-NVD 4.04.1▲
EchelonGraph scoreHIGH confidence

Score elevated to 4.1 because EPSS predicts 32% probability of exploitation within the next 30 days (top 1.9% of all CVEs). CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.0 retained for reference (NVD's own analysis pending). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: cisa-adp, epss, ghsa
Elevated
4.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 32%CVSS: 4.0Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ICMP information such as (1) netmask and (2) timestamp is allowed from arbitrary hosts.

CVSS v3
4.0
EG Score
4.1(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity41% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
32%
EPSS %ILE
98%
KEV
Not listed

Published

August 1, 1997

Last Modified

June 16, 2026

Advisory Details (5)

Auto-updated Jun 19, 2026
No patch confirmed yet.
generic

Test case 11011: ICMP timestamp request | SecureScout

http://descriptions.securescout.com/tc/11011
generic

Test case 11010: ICMP netmask request | SecureScout

http://descriptions.securescout.com/tc/11010
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/322
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/306
generic

CEC Juniper Community

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705

Vendor Advisories for CVE-1999-0524(1)

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 14× 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.

  1. 2026-07-23 00:40 UTCEG score recompute
  2. 2026-07-23 00:23 UTCEG score recompute
  3. 2026-07-22 23:45 UTCEG score recompute▲ 0.10
  4. 2026-07-22 21:25 UTCEG score recompute
  5. 2026-07-20 17:02 UTCEPSS rescore
  6. 2026-07-18 09:59 UTCEPSS rescore
  7. 2026-07-16 16:58 UTCEPSS rescore
  8. 2026-07-15 16:53 UTCEPSS rescore
  9. 2026-07-15 01:55 UTCEPSS rescore
  10. 2026-07-13 06:07 UTCEPSS rescore
  11. 2026-07-11 08:22 UTCEPSS rescore
  12. 2026-07-04 06:26 UTCEPSS rescore
  13. 2026-07-02 14:00 UTCEPSS rescore
  14. 2026-06-28 14:02 UTCEPSS rescore
  15. 2026-06-27 03:04 UTCEPSS rescore
  16. 2026-06-24 14:01 UTCEPSS rescore
  17. 2026-06-23 21:29 UTCEPSS rescore
  18. 2026-06-21 01:56 UTCEPSS rescore
  19. 2026-06-19 19:22 UTCEPSS rescore
  20. 2026-06-18 17:49 UTCEPSS rescore
  21. 2026-06-18 17:49 UTCEPSS rescore
  22. 2026-06-17 17:49 UTCEPSS rescore
  23. 2026-06-16 17:49 UTCEPSS rescore
  24. 2026-06-14 23:13 UTCEPSS rescore
  25. 2026-06-13 22:56 UTCEPSS rescore
Show 37 more
  1. 2026-06-12 23:07 UTCEPSS rescore
  2. 2026-06-11 13:55 UTCEPSS rescore
  3. 2026-06-10 22:13 UTCEPSS rescore
  4. 2026-06-10 13:17 UTCEPSS rescore
  5. 2026-06-08 14:13 UTCEPSS rescore
  6. 2026-06-07 15:21 UTCEPSS rescore
  7. 2026-06-06 13:44 UTCEPSS rescore
  8. 2026-06-05 06:07 UTCEPSS rescore
  9. 2026-06-04 13:09 UTCEPSS rescore
  10. 2026-06-02 20:10 UTCEPSS rescore
  11. 2026-06-01 13:48 UTCEPSS rescore
  12. 2026-05-31 23:01 UTCEG score recompute
  13. 2026-05-31 23:01 UTCVendor advisory
  14. 2026-05-31 23:01 UTCGHSA enrichment
  15. 2026-05-31 22:27 UTCEPSS rescore
  16. 2026-05-31 00:13 UTCEPSS rescore
  17. 2026-05-31 00:13 UTCEPSS rescore
  18. 2026-05-29 13:40 UTCEPSS rescore
  19. 2026-05-28 13:42 UTCEPSS rescore
  20. 2026-05-28 13:42 UTCEPSS rescore
  21. 2026-05-28 13:42 UTCEPSS rescore
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-27 13:37 UTCEPSS rescore
  24. 2026-05-27 13:37 UTCEPSS rescore
  25. 2026-05-26 13:41 UTCEPSS rescore
  26. 2026-05-26 13:41 UTCEPSS rescore
  27. 2026-05-26 13:41 UTCEPSS rescore
  28. 2026-05-26 07:16 UTCEPSS rescore
  29. 2026-05-26 07:16 UTCEPSS rescore
  30. 2026-05-24 16:42 UTCEPSS rescore
  31. 2026-05-22 21:15 UTCEPSS rescore
  32. 2026-05-21 22:38 UTCEPSS rescore
  33. 2026-05-20 22:36 UTCEPSS rescore
  34. 2026-05-20 11:20 UTCEPSS rescore
  35. 2026-05-20 11:20 UTCEPSS rescore
  36. 2026-05-18 21:29 UTCEPSS rescore
  37. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCthreatlabindonesia/CVE-1999-0524-ICMP-Timestamp-and-Address-Mask-Request-Exploit
    First seen Nov 25, 2024
    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-1999-0524?
CVE-1999-0524 is a medium vulnerability published on August 1, 1997. ICMP information such as (1) netmask and (2) timestamp is allowed from arbitrary hosts.
When was CVE-1999-0524 disclosed?
CVE-1999-0524 was first published in the National Vulnerability Database on August 1, 1997, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-1999-0524 actively exploited?
CVE-1999-0524 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32% probability of exploitation in the next 30 days, which ranks it in the top 1.9% of all scored CVEs.
What is the CVSS score of CVE-1999-0524?
CVE-1999-0524 has a CVSS v3.1 base score of 4.0 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.1.
How do I remediate CVE-1999-0524?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0524, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-1999-0524

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