CVE-2010-4344

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 5 sources updated this weekExploited in the wild
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 72%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
99.4%
KEV
⚠ Exploited

Published

December 14, 2010

Last Modified

April 21, 2026

Advisory Details (7)

Auto-updated Apr 29, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

About Secunia Research | Flexera

http://secunia.com/advisories/42586
generic

About Secunia Research | Flexera

http://secunia.com/advisories/42576
generic

About Secunia Research | Flexera

http://secunia.com/advisories/40019
generic

oss-security - Exim remote root

http://openwall.com/lists/oss-security/2010/12/10/1
generic🔴 Active Exploitation

Re: [exim-dev] Remote root vulnerability in Exim

http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.html
generic

exim - Exim Forgejo

http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6b
generic

Exim Internet Mailer

http://bugs.exim.org/show_bug.cgi?id=787

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuexim4-daemon-light (4.69-11ubuntu4.1) @ karmic2026-07-13ubuntu
redhatexim-0:4.63-3.el5_4.12010-12-10redhat

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.

Weakness Classification(1)

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

All Vendor Advisories

(2)

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 144× in last 7d / 619× 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 967 total refreshes for this CVE.

  1. 2026-07-14 06:14 UTCEG score recompute
  2. 2026-07-14 06:14 UTCVendor advisory
  3. 2026-07-14 06:14 UTCGHSA enrichment
  4. 2026-07-14 02:32 UTCEG score recompute
  5. 2026-07-14 02:32 UTCVendor advisory
  6. 2026-07-14 02:32 UTCGHSA enrichment
  7. 2026-07-13 22:52 UTCEG score recompute
  8. 2026-07-13 22:52 UTCVendor advisory
  9. 2026-07-13 22:52 UTCGHSA enrichment
  10. 2026-07-13 22:25 UTCEPSS rescore
  11. 2026-07-13 19:12 UTCEG score recompute
  12. 2026-07-13 19:12 UTCVendor advisory
  13. 2026-07-13 19:12 UTCGHSA enrichment
  14. 2026-07-13 17:07 UTCCISA KEV update
  15. 2026-07-13 15:31 UTCEG score recompute
  16. 2026-07-13 15:31 UTCVendor advisory
  17. 2026-07-13 15:31 UTCGHSA enrichment
  18. 2026-07-13 11:50 UTCEG score recompute
  19. 2026-07-13 11:50 UTCVendor advisory
  20. 2026-07-13 11:50 UTCGHSA enrichment
  21. 2026-07-13 08:09 UTCEG score recompute
  22. 2026-07-13 08:09 UTCVendor advisory
  23. 2026-07-13 08:09 UTCGHSA enrichment
  24. 2026-07-13 06:08 UTCEPSS rescore
  25. 2026-07-13 04:28 UTCEG score recompute
Show 75 more
  1. 2026-07-13 04:28 UTCVendor advisory
  2. 2026-07-13 04:28 UTCGHSA enrichment
  3. 2026-07-13 00:46 UTCEG score recompute
  4. 2026-07-13 00:46 UTCVendor advisory
  5. 2026-07-13 00:46 UTCGHSA enrichment
  6. 2026-07-12 21:04 UTCEG score recompute
  7. 2026-07-12 21:04 UTCVendor advisory
  8. 2026-07-12 21:04 UTCGHSA enrichment
  9. 2026-07-12 17:22 UTCEG score recompute
  10. 2026-07-12 17:22 UTCVendor advisory
  11. 2026-07-12 17:22 UTCGHSA enrichment
  12. 2026-07-12 13:42 UTCEG score recompute
  13. 2026-07-12 13:42 UTCVendor advisory
  14. 2026-07-12 13:41 UTCGHSA enrichment
  15. 2026-07-12 10:01 UTCEG score recompute
  16. 2026-07-12 10:01 UTCVendor advisory
  17. 2026-07-12 10:01 UTCGHSA enrichment
  18. 2026-07-12 06:20 UTCEG score recompute
  19. 2026-07-12 06:20 UTCVendor advisory
  20. 2026-07-12 06:20 UTCGHSA enrichment
  21. 2026-07-12 02:39 UTCEG score recompute
  22. 2026-07-12 02:39 UTCVendor advisory
  23. 2026-07-12 02:39 UTCGHSA enrichment
  24. 2026-07-11 22:56 UTCEG score recompute
  25. 2026-07-11 22:56 UTCVendor advisory
  26. 2026-07-11 22:56 UTCGHSA enrichment
  27. 2026-07-11 19:15 UTCEG score recompute
  28. 2026-07-11 19:15 UTCVendor advisory
  29. 2026-07-11 19:15 UTCGHSA enrichment
  30. 2026-07-11 15:34 UTCEG score recompute
  31. 2026-07-11 15:34 UTCVendor advisory
  32. 2026-07-11 15:34 UTCGHSA enrichment
  33. 2026-07-11 11:53 UTCEG score recompute
  34. 2026-07-11 11:53 UTCVendor advisory
  35. 2026-07-11 11:53 UTCGHSA enrichment
  36. 2026-07-11 08:22 UTCEPSS rescore
  37. 2026-07-11 08:12 UTCEG score recompute
  38. 2026-07-11 08:12 UTCVendor advisory
  39. 2026-07-11 08:12 UTCGHSA enrichment
  40. 2026-07-11 04:31 UTCEG score recompute
  41. 2026-07-11 04:31 UTCVendor advisory
  42. 2026-07-11 04:31 UTCGHSA enrichment
  43. 2026-07-11 00:50 UTCEG score recompute
  44. 2026-07-11 00:50 UTCVendor advisory
  45. 2026-07-11 00:50 UTCGHSA enrichment
  46. 2026-07-10 21:09 UTCEG score recompute
  47. 2026-07-10 21:09 UTCVendor advisory
  48. 2026-07-10 21:09 UTCGHSA enrichment
  49. 2026-07-10 17:52 UTCCISA KEV update
  50. 2026-07-10 17:29 UTCEG score recompute
  51. 2026-07-10 17:29 UTCVendor advisory
  52. 2026-07-10 17:28 UTCGHSA enrichment
  53. 2026-07-10 13:48 UTCEG score recompute
  54. 2026-07-10 13:48 UTCVendor advisory
  55. 2026-07-10 13:48 UTCGHSA enrichment
  56. 2026-07-10 10:06 UTCEG score recompute
  57. 2026-07-10 10:06 UTCVendor advisory
  58. 2026-07-10 10:06 UTCGHSA enrichment
  59. 2026-07-10 06:25 UTCEG score recompute
  60. 2026-07-10 06:25 UTCVendor advisory
  61. 2026-07-10 06:25 UTCGHSA enrichment
  62. 2026-07-10 02:44 UTCEG score recompute
  63. 2026-07-10 02:44 UTCVendor advisory
  64. 2026-07-10 02:44 UTCGHSA enrichment
  65. 2026-07-09 23:03 UTCEG score recompute
  66. 2026-07-09 23:03 UTCVendor advisory
  67. 2026-07-09 23:03 UTCGHSA enrichment
  68. 2026-07-09 19:22 UTCEG score recompute
  69. 2026-07-09 19:22 UTCVendor advisory
  70. 2026-07-09 19:22 UTCGHSA enrichment
  71. 2026-07-09 15:42 UTCEG score recompute
  72. 2026-07-09 15:42 UTCVendor advisory
  73. 2026-07-09 15:41 UTCGHSA enrichment
  74. 2026-07-09 12:00 UTCEG score recompute
  75. 2026-07-09 12:00 UTCVendor advisory

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-16925✓ verified
    First seen Dec 16, 2010

    Exim4 < 4.69 - string_format Function Heap Buffer Overflow (Metasploit)

    Open source ↗
  • Exploit-DBEDB-15725✓ verified
    First seen Dec 11, 2010

    Exim 4.63 - Remote Command Execution

    Open source ↗
  • Metasploitexploit/unix/smtp/exim4_string_format✓ verified
    First seen Dec 7, 2010

    Exim4 string_format Function Heap Buffer Overflow

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2010-4344?
CVE-2010-4344 is a critical vulnerability published on December 14, 2010. Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.
When was CVE-2010-4344 disclosed?
CVE-2010-4344 was first published in the National Vulnerability Database on December 14, 2010, with the most recent update on April 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2010-4344 actively exploited?
Yes. CISA added CVE-2010-4344 to the Known Exploited Vulnerabilities catalog on March 25, 2022, affecting Exim Exim. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2010-4344?
CVE-2010-4344 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2010-4344?
CVE-2010-4344 affects Exim Exim. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2010-4344?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2010-4344, 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

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