CVE-1999-1053

HIGHCVSS v2 · 7.57.5—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.5 — v2 rates that HIGH (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:P/I:P/A:P. 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 85.2% 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
Weaponized
7.5EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 85%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 85%CVSS v2: 7.5Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

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

guestbook.pl cleanses user-inserted SSI commands by removing text between "" separators, which allows remote attackers to execute arbitrary commands when guestbook.pl is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".

CVSS v2.0 (legacy)
7.5HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.5(low)
EG Risk
72(Track)
EG Risk 72/100SSVC: 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
Severity75% × 45%
Exploitation85% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
85%
EPSS %ILE
100%
KEV
Not listed

Published

September 13, 1999

Last Modified

June 16, 2026

References (8)

Data Freshness Timeline

(refreshed 6× in last 7d / 12× 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 13:19 UTCEG score recompute▲ 7.50
  2. 2026-07-23 00:41 UTCEG score recompute
  3. 2026-07-23 00:26 UTCGHSA enrichment
  4. 2026-07-23 00:23 UTCEG score recompute▼ 9.00
  5. 2026-07-22 23:46 UTCEG score recompute
  6. 2026-07-22 21:26 UTCEG score recompute
  7. 2026-07-20 17:02 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. 2026-07-04 06:26 UTCEPSS rescore
  12. 2026-06-29 14:02 UTCEPSS rescore
  13. 2026-06-23 21:29 UTCEPSS rescore
  14. 2026-06-21 01:56 UTCEPSS rescore
  15. 2026-06-13 22:56 UTCEPSS rescore
  16. 2026-06-12 23:07 UTCEPSS rescore
  17. 2026-06-10 22:13 UTCEPSS rescore
  18. 2026-06-06 13:44 UTCEPSS rescore
  19. 2026-06-02 20:10 UTCEPSS rescore
  20. 2026-05-31 22:17 UTCEG score recompute
  21. 2026-05-31 22:17 UTCGHSA enrichment
  22. 2026-05-31 00:13 UTCEPSS rescore
  23. 2026-05-31 00:13 UTCEPSS rescore
  24. 2026-05-20 22:36 UTCEPSS rescore
  25. 2026-05-18 21:29 UTCEPSS rescore
Show 1 more
  1. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16914✓ verified
    First seen Jul 3, 2010

    The Matt Wright Guestbook.pl - Arbitrary Command Execution (Metasploit)

    Open source ↗
  • Exploit-DBEDB-9907✓ verified
    First seen Nov 5, 1999

    The Matt Wright Guestbook.pl 2.3.1 - Server-Side Include

    Open source ↗
  • Metasploitexploit/unix/webapp/guestbook_ssi_exec✓ verified
    First seen Nov 5, 1999

    Matt Wright guestbook.pl Arbitrary Command Execution

    Open source ↗

Frequently asked(4)

What is CVE-1999-1053?
CVE-1999-1053 is a high vulnerability published on September 13, 1999. guestbook.pl cleanses user-inserted SSI commands by removing text between "<!--" and "-->" separators, which allows remote attackers to execute arbitrary commands when guestbook.pl is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".
When was CVE-1999-1053 disclosed?
CVE-1999-1053 was first published in the National Vulnerability Database on September 13, 1999, 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-1999-1053 actively exploited?
CVE-1999-1053 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 85% probability of exploitation in the next 30 days, which ranks it in the top 0.3% of all scored CVEs.
How do I remediate CVE-1999-1053?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1053, 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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