CVE-1999-1554

LOWCVSS v2 · 2.12.1—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 2.1 — v2 rates that LOW (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:L/AC:L/Au:N/C:P/I:N/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 0.4% 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
2.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: 2.1Exploit: None knownExposed: 0

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

/usr/sbin/Mail on SGI IRIX 3.3 and 3.3.1 does not properly set the group ID to the group ID of the user who started Mail, which allows local users to read the mail of other users.

CVSS v2.0 (legacy)
2.1LOWNVD never assigned a CVSS v3 rating to this CVE
EG Score
2.1(low)
EG Risk
14(Track)
EG Risk 14/100SSVC: 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
Severity21% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

October 31, 1990

Last Modified

June 16, 2026

References (6)

Data Freshness Timeline

(refreshed 6× in last 7d / 16× 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. 2026-07-26 13:20 UTCEG score recompute▲ 2.10
  2. 2026-07-23 00:41 UTCEG score recompute
  3. 2026-07-23 00:24 UTCEG score recompute
  4. 2026-07-22 23:46 UTCEG score recompute
  5. 2026-07-22 21:26 UTCEG score recompute
  6. 2026-07-20 17:02 UTCEPSS rescore
  7. 2026-07-18 09:59 UTCEPSS rescore
  8. 2026-07-16 16:58 UTCEPSS rescore
  9. 2026-07-15 16:53 UTCEPSS rescore
  10. 2026-07-15 01:55 UTCEPSS rescore
  11. 2026-07-13 06:07 UTCEPSS rescore
  12. 2026-07-11 08:22 UTCEPSS rescore
  13. 2026-07-08 15:08 UTCEPSS rescore
  14. 2026-07-04 06:26 UTCEPSS rescore
  15. 2026-07-02 14:00 UTCEPSS rescore
  16. 2026-06-28 14:02 UTCEPSS rescore
  17. 2026-06-27 03:04 UTCEPSS rescore
  18. 2026-06-24 14:01 UTCEPSS rescore
  19. 2026-06-23 21:29 UTCEPSS rescore
  20. 2026-06-22 14:22 UTCEPSS rescore
  21. 2026-06-21 01:56 UTCEPSS rescore
  22. 2026-06-19 19:22 UTCEPSS rescore
  23. 2026-06-18 17:49 UTCEPSS rescore
  24. 2026-06-18 17:49 UTCEPSS rescore
  25. 2026-06-17 17:49 UTCEPSS rescore
Show 39 more
  1. 2026-06-16 17:49 UTCEPSS rescore
  2. 2026-06-14 23:13 UTCEPSS rescore
  3. 2026-06-13 22:56 UTCEPSS rescore
  4. 2026-06-12 23:07 UTCEPSS rescore
  5. 2026-06-11 13:55 UTCEPSS rescore
  6. 2026-06-10 22:13 UTCEPSS rescore
  7. 2026-06-10 13:17 UTCEPSS rescore
  8. 2026-06-08 14:13 UTCEPSS rescore
  9. 2026-06-07 15:21 UTCEPSS rescore
  10. 2026-06-06 13:44 UTCEPSS rescore
  11. 2026-06-05 06:07 UTCEPSS rescore
  12. 2026-06-04 13:09 UTCEPSS rescore
  13. 2026-06-02 20:10 UTCEPSS rescore
  14. 2026-06-01 13:48 UTCEPSS rescore
  15. 2026-05-31 23:17 UTCEG score recompute
  16. 2026-05-31 23:17 UTCGHSA enrichment
  17. 2026-05-31 22:27 UTCEPSS rescore
  18. 2026-05-31 00:13 UTCEPSS rescore
  19. 2026-05-31 00:13 UTCEPSS rescore
  20. 2026-05-29 13:40 UTCEPSS rescore
  21. 2026-05-28 13:42 UTCEPSS rescore
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-28 13:42 UTCEPSS rescore
  24. 2026-05-28 13:42 UTCEPSS rescore
  25. 2026-05-27 13:37 UTCEPSS rescore
  26. 2026-05-27 13:37 UTCEPSS rescore
  27. 2026-05-26 13:41 UTCEPSS rescore
  28. 2026-05-26 13:41 UTCEPSS rescore
  29. 2026-05-26 13:41 UTCEPSS rescore
  30. 2026-05-26 07:16 UTCEPSS rescore
  31. 2026-05-26 07:16 UTCEPSS rescore
  32. 2026-05-24 16:42 UTCEPSS rescore
  33. 2026-05-22 21:15 UTCEPSS rescore
  34. 2026-05-21 22:38 UTCEPSS rescore
  35. 2026-05-20 22:36 UTCEPSS rescore
  36. 2026-05-20 11:20 UTCEPSS rescore
  37. 2026-05-20 11:20 UTCEPSS rescore
  38. 2026-05-18 21:29 UTCEPSS rescore
  39. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-1999-1554?
CVE-1999-1554 is a low vulnerability published on October 31, 1990. /usr/sbin/Mail on SGI IRIX 3.3 and 3.3.1 does not properly set the group ID to the group ID of the user who started Mail, which allows local users to read the mail of other users.
When was CVE-1999-1554 disclosed?
CVE-1999-1554 was first published in the National Vulnerability Database on October 31, 1990, 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-1999-1554 actively exploited?
CVE-1999-1554 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.5% of all scored CVEs.
How do I remediate CVE-1999-1554?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1554, 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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