CVE-2016-10034

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 38% (98th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 38%CVSS: 9.8Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

The setFrom function in the Sendmail adapter in the zend-mail component before 2.4.11, 2.5.x, 2.6.x, and 2.7.x before 2.7.2, and Zend Framework before 2.4.11 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double quote) in a crafted e-mail address.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
38%
EPSS %ILE
98th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

December 30, 2016

Last Modified

June 17, 2026

Advisory Details (8)

Auto-updated Oct 7, 2026
Patch available.
Web page

CVE-2016-10034 - PSIRT.COM

http://www.securityfocus.com/bid/95144
Web page

PHPMailer < 5.2.20 with Exim MTA - Remote Code Execution - PHP webapps Exploit

https://www.exploit-db.com/exploits/42221/
Web page

PHPMailer < 5.2.20 / SwiftMailer < 5.4.5-DEV / Zend Framework / zend-mail < 2.4.11 - 'AIO' 'PwnScriptum' Remote Code Execution - PHP webapps Exploit

https://www.exploit-db.com/exploits/40986/
Web page

Zend Framework / zend-mail < 2.4.11 - Remote Code Execution - PHP webapps Exploit

https://www.exploit-db.com/exploits/40979/
Web page

Zend Framework: Multiple vulnerabilities (GLSA 201804-10) — Gentoo security

https://security.gentoo.org/glsa/201804-10
Web page

ZendFramework-Exploit-ZendMail-Remote-Code-Exec-CVE-2016-10034-Vuln

https://legalhackers.com/advisories/ZendFramework-Exploit-ZendMail-Remote-Code-Exec-CVE-2016-10034-Vuln.html
Web page

Security Advisory - Security - Zend Framework

https://framework.zend.com/security/advisory/ZF2016-04

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
zendframework/zend-mail2.7.0, 2.7.1
  • every version up to 2.4.11: fixed in 2.4.11
  • 2.5 through 2.5.2: no fix on record
  • 2.6 through 2.6.2: no fix on record
  • 2.7 up to 2.7.2: fixed in 2.7.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 23× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 88 of 116 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 12 repeat rows among the latest 100 are merged into the row they repeat. The 28 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:26 UTCEPSS rescoreEPSS 38% · 98th percentile
  2. 2026-10-15 13:33 UTCEG score recompute
  3. 2026-10-14 16:27 UTCEPSS rescoreEPSS 38% · 98th percentile
  4. 2026-10-14 08:34 UTCEG score recompute
  5. 2026-10-13 16:26 UTCEPSS rescoreEPSS 38% · 98th percentile
  6. 2026-10-12 20:46 UTCEG score recompute
  7. 2026-10-12 01:10 UTCEG score recompute
  8. 2026-10-11 13:40 UTCEPSS rescoreEPSS 38% · 98th percentile
  9. 2026-10-10 19:54 UTCEPSS rescoreEPSS 38% · 98th percentile
  10. 2026-10-09 20:01 UTCEPSS rescoreEPSS 38% · 98th percentile
  11. 2026-10-08 16:35 UTCEPSS rescoreEPSS 38% · 98th percentile
  12. 2026-10-07 23:40 UTCEPSS rescoreEPSS 38% · 98th percentile
  13. 2026-10-06 15:11 UTCEPSS rescoreEPSS 38% · 98th percentile
  14. 2026-10-05 17:38 UTCEPSS rescoreEPSS 38% · 98th percentile
  15. 2026-10-04 12:48 UTCOSV refresh
  16. 2026-10-03 14:21 UTCEPSS rescoreEPSS 38% · 98th percentile
  17. 2026-09-30 14:58 UTCEPSS rescoreEPSS 38% · 98th percentile
  18. 2026-09-30 09:09 UTCEG score recompute
  19. 2026-09-26 15:53 UTCEPSS rescoreEPSS 38% · 98th percentile
  20. 2026-09-23 13:41 UTCEPSS rescoreEPSS 38% · 98th percentile
  21. 2026-09-19 15:35 UTCEPSS rescoreEPSS 38% · 98th percentile
  22. 2026-09-18 19:22 UTCEPSS rescoreEPSS 38% · 98th percentile
  23. 2026-09-17 19:21 UTCEPSS rescoreEPSS 38% · 98th percentile
  24. 2026-09-15 03:05 UTCEPSS rescoreEPSS 38% · 98th percentile
  25. 2026-09-15 02:44 UTCOSV refresh
Show 63 more
  1. 2026-09-12 14:55 UTCEPSS rescoreEPSS 38% · 98th percentile
  2. 2026-09-11 09:31 UTCEPSS rescoreEPSS 38% · 98th percentile
  3. 2026-09-10 09:26 UTCEPSS rescoreEPSS 38% · 98th percentile
  4. 2026-09-06 13:42 UTCEPSS rescoreEPSS 38% · 98th percentile
  5. 2026-09-04 13:55 UTCEPSS rescoreEPSS 38% · 98th percentile
  6. 2026-09-02 14:07 UTCEPSS rescoreEPSS 38% · 98th percentile
  7. 2026-09-01 13:48 UTCEPSS rescoreEPSS 38% · 98th percentile
  8. 2026-08-27 02:30 UTCOSV refresh
  9. 2026-08-26 14:41 UTCEPSS rescoreEPSS 38% · 98th percentile
  10. 2026-08-25 13:44 UTCEPSS rescoreEPSS 38% · 98th percentile
  11. 2026-08-23 00:13 UTCEPSS rescoreEPSS 38% · 98th percentile
  12. 2026-08-21 23:44 UTCEPSS rescoreEPSS 38% · 98th percentile
  13. 2026-08-20 22:50 UTCEPSS rescoreEPSS 38% · 98th percentile
  14. 2026-08-19 16:59 UTCEPSS rescoreEPSS 38% · 98th percentile
  15. 2026-08-16 14:51 UTCEPSS rescoreEPSS 38% · 98th percentile
  16. 2026-08-16 02:09 UTCEPSS rescoreEPSS 38% · 98th percentile
  17. 2026-08-15 01:25 UTCEPSS rescoreEPSS 38% · 98th percentile
  18. 2026-08-12 13:46 UTCEPSS rescoreEPSS 38% · 98th percentile
  19. 2026-08-11 13:36 UTCEPSS rescoreEPSS 38% · 98th percentile
  20. 2026-08-10 15:38 UTCOSV refresh
  21. 2026-08-09 13:42 UTCEPSS rescoreEPSS 38% · 98th percentile
  22. 2026-08-07 16:22 UTCEPSS rescoreEPSS 38% · 98th percentile
  23. 2026-08-06 13:42 UTCEPSS rescoreEPSS 38% · 98th percentile
  24. 2026-08-05 19:12 UTCEPSS rescoreEPSS 38% · 98th percentile
  25. 2026-08-04 15:04 UTCEPSS rescoreEPSS 38% · 98th percentile
  26. 2026-08-04 10:31 UTCEPSS rescoreEPSS 38% · 98th percentile
  27. 2026-08-01 04:11 UTCEPSS rescoreEPSS 38% · 98th percentile
  28. 2026-07-28 15:31 UTCEPSS rescoreEPSS 38% · 98th percentile
  29. 2026-07-26 14:50 UTCEPSS rescoreEPSS 38% · 98th percentile
  30. 2026-07-25 16:30 UTCOSV refresh
  31. 2026-07-25 14:13 UTCEPSS rescoreEPSS 38% · 98th percentile
  32. 2026-07-24 14:13 UTCEPSS rescoreEPSS 38% · 98th percentile
  33. 2026-07-23 14:14 UTCEPSS rescoreEPSS 38% · 98th percentile
  34. 2026-07-23 01:21 UTCEG score recompute
  35. 2026-07-23 00:22 UTCEG score recompute
  36. 2026-07-22 22:00 UTCEG score recompute
  37. 2026-07-22 14:04 UTCEPSS rescoreEPSS 38% · 98th percentile
  38. 2026-07-21 15:21 UTCEPSS rescoreEPSS 38% · 98th percentile
  39. 2026-07-20 17:03 UTCEPSS rescoreEPSS 38% · 98th percentile
  40. 2026-07-19 02:26 UTCEPSS rescoreEPSS 38% · 98th percentile
  41. 2026-07-18 10:00 UTCEPSS rescoreEPSS 38% · 98th percentile
  42. 2026-07-16 16:59 UTCEPSS rescoreEPSS 38% · 98th percentile
  43. 2026-07-15 16:54 UTCEPSS rescoreEPSS 38% · 98th percentile
  44. 2026-07-15 01:56 UTCEPSS rescoreEPSS 38% · 98th percentile
  45. 2026-07-13 22:26 UTCEPSS rescoreEPSS 38% · 98th percentile
  46. 2026-07-12 05:42 UTCEPSS rescoreEPSS 38% · 98th percentile
  47. 2026-07-11 08:23 UTCEPSS rescoreEPSS 38% · 98th percentile
  48. 2026-07-09 19:05 UTCEPSS rescoreEPSS 38% · 98th percentile
  49. 2026-07-08 15:10 UTCEPSS rescoreEPSS 38% · 98th percentile
  50. 2026-07-08 11:05 UTCOSV refresh
  51. 2026-07-06 02:20 UTCEPSS rescoreEPSS 38% · 98th percentile
  52. 2026-07-01 15:02 UTCEPSS rescoreEPSS 38% · 98th percentile
  53. 2026-06-30 23:19 UTCEPSS rescoreEPSS 38% · 98th percentile
  54. 2026-06-28 14:04 UTCEPSS rescoreEPSS 38% · 98th percentile
  55. 2026-06-28 04:53 UTCEPSS rescoreEPSS 38% · 98th percentile
  56. 2026-06-27 03:05 UTCEPSS rescoreEPSS 38% · 98th percentile
  57. 2026-06-25 13:47 UTCEPSS rescoreEPSS 38% · 98th percentile
  58. 2026-06-24 14:02 UTCEPSS rescoreEPSS 38% · 98th percentile
  59. 2026-06-23 21:30 UTCEPSS rescoreEPSS 38% · 98th percentile
  60. 2026-06-22 14:23 UTCEPSS rescoreEPSS 38% · 98th percentile
  61. 2026-06-21 01:57 UTCEPSS rescoreEPSS 38% · 98th percentile
  62. 2026-06-19 23:06 UTCOSV refresh
  63. 2026-06-19 19:23 UTCEPSS rescoreEPSS 38% · 98th percentile

Publicly available exploits

(3 references)

Public exploit code is referenced for this CVE (3 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-42221
    Published Jun 21, 2017

    PHPMailer < 5.2.20 with Exim MTA - Remote Code Execution

    Open source ↗
  • Exploit-DBEDB-40986
    Published Jan 2, 2017

    PHPMailer < 5.2.20 / SwiftMailer < 5.4.5-DEV / Zend Framework / zend-mail < 2.4.11 - 'AIO' 'PwnScriptum' Remote Code Execution

    Open source ↗
  • Exploit-DBEDB-40979
    Published Dec 30, 2016

    Zend Framework / zend-mail < 2.4.11 - Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2016-10034?
CVE-2016-10034 is a critical-severity vulnerability; its CVE record was published on December 30, 2016. The setFrom function in the Sendmail adapter in the zend-mail component before 2.4.11, 2.5.x, 2.6.x, and 2.7.x before 2.7.2, and Zend Framework before 2.4.11 might allow remote attackers to pass extra parameters to the mail command and consequently execute arbitrary code via a \" (backslash double…
When was CVE-2016-10034 made public?
CVE-2016-10034 was made public on December 20, 2016: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on December 30, 2016. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2016-10034 actively exploited?
CVE-2016-10034 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38% probability of exploitation in the next 30 days (98th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2016-10034?
CVE-2016-10034 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-10034?
A fix for CVE-2016-10034 is available: update to the fixed version the vendor names in its advisory.

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