Mail Client Software Vulnerabilities


The analysis of the timeline helps to identify the required approach and handling of single vulnerabilities and vulnerability collections. This overview makes it possible to see less important slices and more severe hotspots at a glance. Initiating immediate vulnerability response and prioritizing of issues is possible.


Not Defined147

Identifying all affected vendors is a good starting point for an overview. This makes it possible to determine an homogeneous landscape or the most important hotspots in heterogeneous landscapes.


Mozilla Thunderbird101
GNU Mailman39
Microsoft Outlook Express24

Grouping vulnerabilities by products helps to get an overview. This makes it possible to determine an homogeneous landscape or the most important hotspots in heterogeneous landscapes.


Official Fix326
Temporary Fix0
Not Defined88

Vendors and researchers are eager to find countermeasures to mitigate security vulnerabilities. These can be distinguished between multiple forms and levels of remediation which influence risks differently.


Not Defined299

Researcher and attacker which are looking for security vulnerabilities try to exploit them for academic purposes or personal gain. The level and quality of exploitability can be distinguished to determine simplicity and strength of attacks.

Access Vector

Not Defined0

The approach a vulnerability it becomes important to use the expected access vector. This is typically via the network, local, or physically even.


Not Defined0

To exploit a vulnerability a certail level of authentication might be required. Vulnerabilities without such a requirement are much more popular.

User Interaction

Not Defined0

Some attack scenarios require some user interaction by a victim. This is typical for phishing, social engineering and cross site scripting attacks.

C3BM Index

Our unique C3BM Index (CVSSv3 Base Meta Index) cumulates the CVSSv3 Meta Base Scores of all entries over time. Comparing this index to the amount of disclosed vulnerabilities helps to pinpoint the most important events.

CVSSv3 Base


The Common Vulnerability Scoring System (CVSS) is an industry standard to define the characteristics and impacts of security vulnerabilities. The base score represents the intrinsic aspects that are constant over time and across user environments. Our unique meta score merges all available scores from different sources to aggregate to the most reliable result.

CVSSv3 Temp


The Common Vulnerability Scoring System (CVSS) uses temp scores to reflect the characteristics of a vulnerability that may change over time but not across user environments. This includes reporting confidence, exploitability and remediation levels. We do also provide our unique meta score for temp scores, even though other sources rarely publish them.



The moderation team is always defining the base vector and base score for an entry. These and all other available scores are used to generate the meta score.



The National Vulnerability Database (NVD) is also defining CVSS vectors and scores. These are usually not complete and might differ from VulDB scores.



A CVE Numbering Authority (CNA) is responsible for assigning new CVE entries. They might also include a CVSS score. These are usually not complete and might differ from VulDB scores.



Some vendors are willing to publish their own CVSS vectors and scores for vulnerabilities in their products. The coverage varies from vendor to vendor.



There are sometimes also security researcher which provide their own CVSS vectors and scores for vulnerabilities they have found and published.

Exploit 0-day


The moderation team is working with the threat intelligence team to determine prices for exploits. Our unique algorithm is used to identify the 0-day prices for an exploit, before it got distributed or became public. Calculated prices are aligned to prices disclosed by vulnerability broker and compared to prices we see on exploit markets.

Exploit Today


The 0-day prices do not consider time-relevant factors. The today price does reflect price impacts like disclosure of vulnerability details, alternative exploits, availability of countermeasures. These dynamic aspects might decrease the exploit prices over time. Under certain circumstances this happens very fast.

Exploit Market Volume

Our unique calculation of exploit prices makes it possible to forecast the expected exploit market volume. The calculated prices for all possible 0-day expoits are cumulated for this task. Comparing the volume to the amount of disclosed vulnerabilities helps to pinpoint the most important events.

🔴 CTI Activities

Our unique Cyber Threat Intelligence aims to determine the ongoing research of actors to anticipiate their acitivities. Observing exploit markets on the Darknet, discussions of vulnerabilities on mailinglists, and exchanges on social media makes it possible to identify planned attacks. Monitored actors and activities are classified whether they are offensive or defensive. They are also weighted as some actors are well-known for certain products and technologies. And some of their disclosures might contain more or less details about technical aspects and personal context. The world map highlights active actors in real-time.

Affected Products (55): Balsa, Claws Mail, Claws Mail vCalendar Plugin, claws mail tools, Futomis Cgi Cafe KMail CGI, GNU Mailman, GNU Mailman Postorius, Ipmotor QuarkMail, KDE KMail, KDE Kmail, KDE messagelib, kmail, KMail, Kmail, Lukas Ruf muttprint, Microsoft Outlook Express, Microsoft Outlook Express Book Control, Microsoft Windows Mail, Mozilla Firefox ESR, Mozilla SeaMonkey, Mozilla Thunderbird, mozilla Thunderbird, Mozilla Thunderbird ESR, mutt, Mutt, mutt mail client, Mutt mail client, Mutt Mail Client, NeoMutt, Opera Mail, Qualcomm Eudora, Qualcomm Eudora Internet Mail Server, Qualcomm Eudora WorldMail, Qualcomm Eudora Worldmail, Qualcomm Eudora Worldmail Server, Qwikmail QwikMail SMTP, Ritlabs The Bat!, RITLabs The Bat, Ritlabs The Bat, RoundCube, RoundCube Mail, Roundcube webmail, Roundcube Webmail, RoundCube Webmail, RoundCube Webmail, Roundcube Webmail, SquirrelMail, Squirrelmail, Squirrelmail Address Add Plugin, Squirrelmail Gpg Plugin, Squirrelmail GPG Plugin, Squirrelmail SMIME Plugin, Squirrelmail Vacation plugin, Sylpheed, tkmail

01/06/20223.53.4RoundCube E-Mail Message cross site scriptingRoundCubeNot DefinedOfficial Fix0.42CVE-2021-46144
12/09/20215.04.8Mozilla Thunderbird Composition Area code injectionThunderbirdNot DefinedOfficial Fix0.00CVE-2021-43528
12/02/20216.56.4GNU Mailman cross-site request forgeryMailmanNot DefinedOfficial Fix0.21CVE-2021-44227
11/19/20213.53.4RoundCube Attachment Filename Extension cross site scriptingRoundCubeNot DefinedOfficial Fix0.00CVE-2021-44025
11/19/20216.36.0RoundCube sql injectionRoundCubeNot DefinedOfficial Fix0.08CVE-2021-44026
11/13/20213.53.4GNU Mailman Options Page cross site scriptingMailmanNot DefinedOfficial Fix0.00CVE-2021-43331
11/13/20213.13.0GNU Mailman insufficiently protected credentialsMailmanNot DefinedOfficial Fix0.05CVE-2021-43332
11/03/20214.84.7Mozilla Thunderbird SMTP Connection inadequate encryptionThunderbirdNot DefinedOfficial Fix0.05CVE-2021-38502
11/03/20217.57.4Mozilla Firefox ESR/Thunderbird memory corruptionFirefox ESR/ThunderbirdNot DefinedOfficial Fix0.06CVE-2021-38495
10/21/20216.56.4GNU Mailman information disclosureMailmanNot DefinedOfficial Fix0.08CVE-2021-42097
10/21/20214.84.7GNU Mailman Admin Password information disclosureMailmanNot DefinedOfficial Fix0.05CVE-2021-42096
09/10/20215.55.3GNU Mailman Postorius POST Request access controlMailman PostoriusNot DefinedOfficial Fix0.00CVE-2021-40347
08/10/20213.73.7KDE KMail SMTP STARTTLS cleartext transmissionKMailNot DefinedNot Defined0.02CVE-2021-38373
08/06/20215.04.8Mozilla Thunderbird IMAP Server injectionThunderbirdNot DefinedOfficial Fix0.03CVE-2021-29969
07/31/20215.55.3Claws Mail/Sylpheed Link textview.c textview_uri_security_check Privilege EscalationClaws Mail/SylpheedNot DefinedOfficial Fix0.07CVE-2021-37746
06/25/20214.34.1Mozilla Thunderbird OpenPGP Key protection mechanismThunderbirdNot DefinedOfficial Fix0.07CVE-2021-29956
06/25/20212.82.7Mozilla Thunderbird Verification race conditionThunderbirdNot DefinedOfficial Fix0.00CVE-2021-29948
06/25/20214.34.1Mozilla Thunderbird Encrypted Message insufficient verification of data authenticityThunderbirdNot DefinedOfficial Fix0.05CVE-2021-29957
06/25/20214.84.6Mozilla Thunderbird OpenPGP Key state issueThunderbirdNot DefinedOfficial Fix0.03CVE-2021-29950
06/25/20217.06.7Mozilla Thunderbird OTR Protocol untrusted search pathThunderbirdNot DefinedOfficial Fix0.05CVE-2021-29949
06/25/20213.13.0Mozilla Thunderbird OpenPGP Key cleartext transmissionThunderbirdNot DefinedOfficial Fix0.00CVE-2021-23993
06/25/20216.36.0Mozilla Thunderbird OpenPGP Key key managementThunderbirdNot DefinedOfficial Fix0.07CVE-2021-23992
06/25/20213.13.0Mozilla Thunderbird OpenPGP Key cleartext transmissionThunderbirdNot DefinedOfficial Fix0.08CVE-2021-23991
06/25/20213.53.4RoundCube Mail SMTP Configuration test.php cross site scriptingMailNot DefinedOfficial Fix0.03CVE-2020-18671
06/25/20213.53.4RoundCube Mail Database test.php cross site scriptingMailNot DefinedOfficial Fix0.07CVE-2020-18670

391 more entries are not shown

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