How severe is CVE-2020-23879?

CVE-2020-23879 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-23879 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23879?

CVE-2020-23879 affects Flowpaper Pdf2json. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23879?

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

When was CVE-2020-23879 published?

CVE-2020-23879 was published on 2021-11-10 and last updated on 2026-06-17.

CVE-2020-23879

CVE-2020-23879 is a high-severity vulnerability in Flowpaper Pdf2json with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Flowpaper Pdf2json
Published: 2021-11-10
Last modified: 2026-06-17

Description

pdf2json v0.71 was discovered to contain a NULL pointer dereference in the component ObjectStream::getObject.

Frequently asked questions

What is CVE-2020-23879?: pdf2json v0.71 was discovered to contain a NULL pointer dereference in the component ObjectStream::getObject.
How severe is CVE-2020-23879?: CVE-2020-23879 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-23879 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23879?: CVE-2020-23879 affects Flowpaper Pdf2json. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23879?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-23879 published?: CVE-2020-23879 was published on 2021-11-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:flowpaper:pdf2json:0.71:*:*:*:*:*:*:*

More vulnerabilities in Flowpaper Pdf2json

CVE-2020-23878 — Critical (CVSS 9.8): pdf2json v0.71 was discovered to contain a stack buffer overflow in the component XRef::fetch.
CVE-2018-14947 — High (CVSS 8.8): An issue has been found in PDF2JSON 0.69. XmlFontAccu::CSStyle in XmlFonts.cc has Mismatched Memory Management Routines…
CVE-2018-14946 — High (CVSS 8.8): An issue has been found in PDF2JSON 0.69. The HtmlString class in ImgOutputDev.cc has Mismatched Memory Management…
CVE-2020-18750 — High (CVSS 7.8): Buffer overflow in pdf2json 0.69 allows local users to execute arbitrary code by converting a crafted PDF file.
CVE-2020-19475 — Medium (CVSS 5.5): An issue has been found in function CCITTFaxStream::lookChar in PDF2JSON 0.70 that allows attackers to cause a Denial…
CVE-2020-19474 — Medium (CVSS 5.5): An issue has been found in function Gfx::doShowText in PDF2JSON 0.70 that allows attackers to cause a Denial of Service…

All CVEs affecting Flowpaper Pdf2json →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →