How severe is CVE-2019-25646?

CVE-2019-25646 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-25646 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-25646?

CVE-2019-25646 affects Tabslab Mailcarrier. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-25646?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2019-25646 have an EU (EUVD) identifier?

Yes. CVE-2019-25646 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-20031.

When was CVE-2019-25646 published?

CVE-2019-25646 was published on 2026-03-24 and last updated on 2026-06-17.

CVE-2019-25646

CVE-2019-25646 is a critical-severity vulnerability in Tabslab Mailcarrier with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2019-20031
Weakness: CWE-787
Affected product: Tabslab Mailcarrier
Published: 2026-03-24
Last modified: 2026-06-17

Description

Tabs Mail Carrier 2.5.1 contains a buffer overflow vulnerability in the MAIL FROM SMTP command that allows remote attackers to execute arbitrary code by sending a crafted MAIL FROM parameter. Attackers can connect to the SMTP service on port 25 and send a malicious MAIL FROM command with an oversized buffer to overwrite the EIP register and execute a bind shell payload.

Frequently asked questions

What is CVE-2019-25646?: Tabs Mail Carrier 2.5.1 contains a buffer overflow vulnerability in the MAIL FROM SMTP command that allows remote attackers to execute arbitrary code by sending a crafted MAIL FROM parameter. Attackers can connect to the SMTP service on port 25 and send a malicious MAIL FROM command with an oversized buffer to overwrite the EIP register and execute a bind shell payload.
How severe is CVE-2019-25646?: CVE-2019-25646 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-25646 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-25646?: CVE-2019-25646 affects Tabslab Mailcarrier. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-25646?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2019-25646 have an EU (EUVD) identifier?: Yes. CVE-2019-25646 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-20031.
When was CVE-2019-25646 published?: CVE-2019-25646 was published on 2026-03-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:tabslab:mailcarrier:2.5.1:*:*:*:*:*:*:*

More vulnerabilities in Tabslab Mailcarrier

CVE-2019-25364 — Critical (CVSS 9.8): MailCarrier 2.51 contains a buffer overflow vulnerability in the POP3 USER command that allows remote attackers to…
CVE-2019-11682 — Critical (CVSS 9.8): A buffer overflow in the SMTP response service in MailCarrier 2.51 allows the attacker to execute arbitrary code…
CVE-2019-11395 — Critical (CVSS 9.8): A buffer overflow in MailCarrier 2.51 allows remote attackers to execute arbitrary code via a long string, as…

All CVEs affecting Tabslab Mailcarrier →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →